The method
Eight principles. Every claim labelled by how strong the evidence is.
The apps are built on the published strength-and-hypertrophy research — volume dose-response, proximity-to-failure, and the fitness–fatigue model among it — synthesised across the field into eight principles rather than lifted from any single coach’s system. Where tradition contradicts the research, we side with the research and say so.
Strong evidence
Meta-analyses, RCTs, systematic reviews.
Moderate evidence
Smaller or mixed studies; mechanistic support.
Practice / expert
Coaching experience, tradition, or a fighter example — useful for illustration, never proof.
Skill first
A · StrongTechnique and deliberate practice come before everything. Conditioning and strength feed the skill; they never replace the reps.
▸ ▾ The evidence
- Wulf (2013). Attentional focus and motor learning: a review of 15 years. International Review of Sport and Exercise Psychology, 6(1), 77–104. doi:10.1080/1750984X.2012.723728 ↗
- Shea & Morgan (1979). Contextual interference effects on the acquisition, retention, and transfer of a motor skill. Journal of Experimental Psychology: Human Learning and Memory, 5(2), 179–187.
Specificity (SAID)
C · PracticeBuild training around the individual — their leverages, stance, and style. You adapt specifically to the demands you impose.
Economy of motion
A · StrongRelaxation cuts antagonist co-contraction, which buys speed and endurance. An external focus — on the target, not your own limbs — is what trains it.
▸ ▾ The evidence
- Wulf (2013). Attentional focus and motor learning: a review of 15 years. International Review of Sport and Exercise Psychology, 6(1), 77–104. doi:10.1080/1750984X.2012.723728 ↗
Manage load for longevity
A · StrongPeriodise, autoregulate, and deload; respect the ceiling where more volume only adds fatigue. This is the explicit corrective to old-school overtraining culture.
▸ ▾ The evidence
- Schoenfeld, Ogborn & Krieger (2017). Dose–response relationship between weekly resistance-training volume and increases in muscle mass: a systematic review and meta-analysis. Journal of Sports Sciences, 35(11), 1073–1082. doi:10.1080/02640414.2016.1210197 ↗
- Refalo, Helms, Trexler, Hamilton & Fyfe (2023). Influence of resistance-training proximity-to-failure on skeletal-muscle hypertrophy: a systematic review with meta-analysis. Sports Medicine, 53(3), 649–665. doi:10.1007/s40279-022-01784-y ↗
- Androulakis-Korakakis, Fisher & Steele (2020). The minimum effective training dose required to increase 1RM strength in resistance-trained men: a systematic review and meta-analysis. Sports Medicine, 50(4), 751–765.
- Grgic, Schoenfeld, Orazem & Sabol (2022). Effects of resistance training performed to repetition failure or non-failure on muscular strength and hypertrophy: a systematic review and meta-analysis. Journal of Sport and Health Science, 11(2), 202–211.
- Williams, Tolusso, Fedewa & Esco (2017). Comparison of periodized and non-periodized resistance training on maximal strength: a meta-analysis. Sports Medicine, 47(10), 2083–2100.
- Zourdos et al. (2016). Novel resistance-training-specific rating of perceived exertion scale measuring repetitions in reserve. Journal of Strength and Conditioning Research, 30(1), 267–275.
Progressive overload
A · StrongAcross every quality, not just the barbell — rounds, intensity, complexity. Add stimulus over time within what you can recover from.
▸ ▾ The evidence
- Schoenfeld, Ogborn & Krieger (2017). Dose–response relationship between weekly resistance-training volume and increases in muscle mass: a systematic review and meta-analysis. Journal of Sports Sciences, 35(11), 1073–1082. doi:10.1080/02640414.2016.1210197 ↗
- Schoenfeld, Ogborn & Krieger (2016). Effects of resistance-training frequency on measures of muscle hypertrophy: a systematic review and meta-analysis. Sports Medicine, 46(11), 1689–1697. doi:10.1007/s40279-016-0543-8 ↗
- Schoenfeld, Grgic & Krieger (2019). How many times per week should a muscle be trained to maximize muscle hypertrophy? A systematic review and meta-analysis of studies examining the effects of resistance-training frequency. Journal of Sports Sciences, 37(11), 1286–1295.
- Van Every, Lees, Wilson, Nippard & Phillips (2026). Load-induced human skeletal-muscle hypertrophy: mechanisms, myths, and misconceptions. Journal of Sport and Health Science, 15, 101104. source ↗
- Rhea, Alvar, Burkett & Ball (2003). A meta-analysis to determine the dose response for strength development. Medicine & Science in Sports & Exercise, 35(3), 456–464.
- Schoenfeld (2010). The mechanisms of muscle hypertrophy and their application to resistance training. Journal of Strength and Conditioning Research, 24(10), 2857–2872.
Strength & power serve skill
A · StrongThey support the skill, they don’t become it. Program S&C to minimise the interference (concurrent-training) cost against your skill and conditioning work.
▸ ▾ The evidence
- Wilson, Marín, Rhea, Wilson, Loenneke & Anderson (2012). Concurrent training: a meta-analysis examining interference of aerobic and resistance exercises. Journal of Strength and Conditioning Research, 26(8), 2293–2307. doi:10.1519/JSC.0b013e31823a3e2d ↗
- Schumann et al. (2022). Compatibility of concurrent aerobic and strength training for skeletal-muscle size and function: an updated systematic review and meta-analysis. Sports Medicine, 52(3), 601–612.
- Loturco et al. (2016). Strength and power qualities are highly associated with punching impact in elite amateur boxers. Journal of Strength and Conditioning Research, 30(1), 109–116.
Energy systems, matched
B · ModerateCombat sport is repeat-effort and rounds-based. Train the energy systems the way you actually use them — hard efforts with structured rest, plus an aerobic base to recover between bursts.
▸ ▾ The evidence
- Hembrough et al. (2021). High-intensity conditioning for combat athletes: practical recommendations. Applied Sciences, 11(22), 10658. doi:10.3390/app112210658 ↗
Recovery is a training variable
A · StrongSleep, nutrition, and deloads aren’t the opposite of training — they’re when the adaptation happens. Protect them like sessions.
▸ ▾ The evidence
- Morton, Murphy, McKellar, Schoenfeld, Henselmans, Helms, Aragon, Devries, Banfield, Krieger & Phillips (2018). A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults. British Journal of Sports Medicine, 52(6), 376–384. doi:10.1136/bjsports-2017-097608 ↗
- Mah, Mah, Kezirian & Dement (2011). The effects of sleep extension on the athletic performance of collegiate basketball players. Sleep, 34(7), 943–950. doi:10.5665/sleep.1132 ↗
- Fullagar et al. (2015). Sleep and athletic performance: the effects of sleep loss on exercise performance, and physiological and cognitive responses to exercise. Sports Medicine, 45(2), 161–186.
Where gym lore gets it wrong
Some of it is simply wrong; some has been overtaken by better research. These are the ones the apps steer away from.
“More volume always means more muscle.”
Volume drives growth — up to a point. Past your recoverable ceiling, extra sets mostly add fatigue, not muscle. The relationship has diminishing returns, not a straight line.
▸ ▾ The evidence
- Schoenfeld, Ogborn & Krieger (2017). Dose–response relationship between weekly resistance-training volume and increases in muscle mass: a systematic review and meta-analysis. Journal of Sports Sciences, 35(11), 1073–1082. doi:10.1080/02640414.2016.1210197 ↗
- Van Every, Lees, Wilson, Nippard & Phillips (2026). Load-induced human skeletal-muscle hypertrophy: mechanisms, myths, and misconceptions. Journal of Sport and Health Science, 15, 101104. source ↗
- Baz-Valle, Balsalobre-Fernández, Alix-Fages & Santos-Concejero (2022). A systematic review of the effects of different resistance-training volumes on muscle hypertrophy. Journal of Human Kinetics, 81, 199–210.
“Soreness is the goal — no pain, no gain.”
Soreness tracks novelty and muscle damage, not growth. You can grow without ever getting sore, and be wrecked without having grown. It’s a poor progress signal.
▸ ▾ The evidence
- Van Every, Lees, Wilson, Nippard & Phillips (2026). Load-induced human skeletal-muscle hypertrophy: mechanisms, myths, and misconceptions. Journal of Sport and Health Science, 15, 101104. source ↗
- Schoenfeld (2010). The mechanisms of muscle hypertrophy and their application to resistance training. Journal of Strength and Conditioning Research, 24(10), 2857–2872.
“The post-workout hormone spike is what builds muscle.”
Acute testosterone and growth-hormone bumps after a session don’t meaningfully drive hypertrophy. Mechanical tension through a full range, applied progressively, is the primary driver.
▸ ▾ The evidence
- Van Every, Lees, Wilson, Nippard & Phillips (2026). Load-induced human skeletal-muscle hypertrophy: mechanisms, myths, and misconceptions. Journal of Sport and Health Science, 15, 101104. source ↗
- Morton et al. (2016). Neither load nor systemic hormones determine resistance-training-mediated hypertrophy or strength gains in resistance-trained young men. Journal of Applied Physiology, 121(1), 129–138.
“Lifting makes fighters slow and bulky.”
The interference effect between strength and endurance work is real but manageable — sequence and dose it well and strength/power support skill rather than blunt it. Power output correlates strongly with punch impact.
▸ ▾ The evidence
- Wilson, Marín, Rhea, Wilson, Loenneke & Anderson (2012). Concurrent training: a meta-analysis examining interference of aerobic and resistance exercises. Journal of Strength and Conditioning Research, 26(8), 2293–2307. doi:10.1519/JSC.0b013e31823a3e2d ↗
- Schumann et al. (2022). Compatibility of concurrent aerobic and strength training for skeletal-muscle size and function: an updated systematic review and meta-analysis. Sports Medicine, 52(3), 601–612.
- Loturco et al. (2016). Strength and power qualities are highly associated with punching impact in elite amateur boxers. Journal of Strength and Conditioning Research, 30(1), 109–116.
“Skip rest days — more training is always more progress.”
Adaptation happens during recovery. Planned lighter weeks (deloads) and real sleep let the work you’ve already done turn into progress, instead of grinding you into a hole.
▸ ▾ The evidence
- Van Every, Lees, Wilson, Nippard & Phillips (2026). Load-induced human skeletal-muscle hypertrophy: mechanisms, myths, and misconceptions. Journal of Sport and Health Science, 15, 101104. source ↗
- Mah, Mah, Kezirian & Dement (2011). The effects of sleep extension on the athletic performance of collegiate basketball players. Sleep, 34(7), 943–950. doi:10.5665/sleep.1132 ↗
- Fullagar et al. (2015). Sleep and athletic performance: the effects of sleep loss on exercise performance, and physiological and cognitive responses to exercise. Sports Medicine, 45(2), 161–186.
“Train through the injury — pain is weakness leaving.”
This one we flag honestly: there’s no study that makes “train through pain” safe. Sharp or persistent pain is a signal to back off and see a professional, not a badge.
Fighters as illustration
C · PracticeA name makes a principle easier to remember. It doesn’t make it true — every example here is Tier C.
Samart Payakaroon
P1 · P3Relaxed, economical, technically flawless — the case for skill and economy of motion over force.
Saenchai
P4Still elite into his 40s — what managing load and longevity looks like over a career.
Dieselnoi
P2Built a whole style around his height and knees — specificity to the individual.
Muhammad Ali
P3Speed from relaxation, not tension — economy of motion at heavyweight.
Floyd Mayweather
P1 · P3Defense and efficiency over volume — skill compounding over twenty years.
Manny Pacquiao
P6 · P7Athletic strength and conditioning in service of footwork and output — never bulk for its own sake.
References
The sources behind every Tier-A and Tier-B claim above. Thin evidence is labelled Tier C.
Full bibliography (22 sources)
- Schoenfeld, Ogborn & Krieger (2017). Dose–response relationship between weekly resistance-training volume and increases in muscle mass: a systematic review and meta-analysis. Journal of Sports Sciences, 35(11), 1073–1082. doi:10.1080/02640414.2016.1210197 ↗
- Schoenfeld, Ogborn & Krieger (2016). Effects of resistance-training frequency on measures of muscle hypertrophy: a systematic review and meta-analysis. Sports Medicine, 46(11), 1689–1697. doi:10.1007/s40279-016-0543-8 ↗
- Refalo, Helms, Trexler, Hamilton & Fyfe (2023). Influence of resistance-training proximity-to-failure on skeletal-muscle hypertrophy: a systematic review with meta-analysis. Sports Medicine, 53(3), 649–665. doi:10.1007/s40279-022-01784-y ↗
- Schoenfeld, Grgic & Krieger (2019). How many times per week should a muscle be trained to maximize muscle hypertrophy? A systematic review and meta-analysis of studies examining the effects of resistance-training frequency. Journal of Sports Sciences, 37(11), 1286–1295.
- Morton, Murphy, McKellar, Schoenfeld, Henselmans, Helms, Aragon, Devries, Banfield, Krieger & Phillips (2018). A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults. British Journal of Sports Medicine, 52(6), 376–384. doi:10.1136/bjsports-2017-097608 ↗
- Wilson, Marín, Rhea, Wilson, Loenneke & Anderson (2012). Concurrent training: a meta-analysis examining interference of aerobic and resistance exercises. Journal of Strength and Conditioning Research, 26(8), 2293–2307. doi:10.1519/JSC.0b013e31823a3e2d ↗
- Van Every, Lees, Wilson, Nippard & Phillips (2026). Load-induced human skeletal-muscle hypertrophy: mechanisms, myths, and misconceptions. Journal of Sport and Health Science, 15, 101104. source ↗
- Mah, Mah, Kezirian & Dement (2011). The effects of sleep extension on the athletic performance of collegiate basketball players. Sleep, 34(7), 943–950. doi:10.5665/sleep.1132 ↗
- Wulf (2013). Attentional focus and motor learning: a review of 15 years. International Review of Sport and Exercise Psychology, 6(1), 77–104. doi:10.1080/1750984X.2012.723728 ↗
- Baz-Valle, Balsalobre-Fernández, Alix-Fages & Santos-Concejero (2022). A systematic review of the effects of different resistance-training volumes on muscle hypertrophy. Journal of Human Kinetics, 81, 199–210.
- Androulakis-Korakakis, Fisher & Steele (2020). The minimum effective training dose required to increase 1RM strength in resistance-trained men: a systematic review and meta-analysis. Sports Medicine, 50(4), 751–765.
- Grgic, Schoenfeld, Orazem & Sabol (2022). Effects of resistance training performed to repetition failure or non-failure on muscular strength and hypertrophy: a systematic review and meta-analysis. Journal of Sport and Health Science, 11(2), 202–211.
- Williams, Tolusso, Fedewa & Esco (2017). Comparison of periodized and non-periodized resistance training on maximal strength: a meta-analysis. Sports Medicine, 47(10), 2083–2100.
- Schumann et al. (2022). Compatibility of concurrent aerobic and strength training for skeletal-muscle size and function: an updated systematic review and meta-analysis. Sports Medicine, 52(3), 601–612.
- Fullagar et al. (2015). Sleep and athletic performance: the effects of sleep loss on exercise performance, and physiological and cognitive responses to exercise. Sports Medicine, 45(2), 161–186.
- Rhea, Alvar, Burkett & Ball (2003). A meta-analysis to determine the dose response for strength development. Medicine & Science in Sports & Exercise, 35(3), 456–464.
- Loturco et al. (2016). Strength and power qualities are highly associated with punching impact in elite amateur boxers. Journal of Strength and Conditioning Research, 30(1), 109–116.
- Hembrough et al. (2021). High-intensity conditioning for combat athletes: practical recommendations. Applied Sciences, 11(22), 10658. doi:10.3390/app112210658 ↗
- Shea & Morgan (1979). Contextual interference effects on the acquisition, retention, and transfer of a motor skill. Journal of Experimental Psychology: Human Learning and Memory, 5(2), 179–187.
- Schoenfeld (2010). The mechanisms of muscle hypertrophy and their application to resistance training. Journal of Strength and Conditioning Research, 24(10), 2857–2872.
- Zourdos et al. (2016). Novel resistance-training-specific rating of perceived exertion scale measuring repetitions in reserve. Journal of Strength and Conditioning Research, 30(1), 267–275.
- Morton et al. (2016). Neither load nor systemic hormones determine resistance-training-mediated hypertrophy or strength gains in resistance-trained young men. Journal of Applied Physiology, 121(1), 129–138.