Strength or hypertrophy: what you are training
Strength is the capacity to produce maximum tension against a resistance, measured in practice by how much you lift in a movement. Hypertrophy is the increase in muscle size, which can happen across a wide range of loads. Both are born from the same stimulus, contracting the muscle against a resistance it does not master yet, but the emphasis changes the programming: strength training prioritizes heavier loads and few repetitions, hypertrophy training tolerates a wider load range as long as the set gets close to failure. The Darwin strength training guide details the science behind this difference and why strength is a longevity marker; this article focuses on how to program the week, log the load and progress.
The principle that supports both goals: progressive overload
Progressive overload is increasing, gradually and measurably, the demand on the muscle over the weeks, whether through load, repetitions, sets or reduced rest. Without this continuous increase, the body stops adapting after a few weeks on the same stimulus. According to the American College of Sports Medicine (ACSM) 2009 position stand on progression in resistance training, when you manage to complete one to two repetitions more than planned at a given load, in two consecutive sessions, it is time to increase the load by 2 to 10 percent.
Volume, frequency and rest between sets
The same ACSM position stand recommends different frequencies by training level: 2 to 3 days per week for those starting out, 3 to 4 for intermediate and 4 to 5 for advanced. The World Health Organization (WHO), in its 2020 physical activity guideline, recommends that every adult do muscle strengthening activities involving the major muscle groups on 2 or more days per week, the minimum floor even for those not pursuing hypertrophy as a goal.
Rest between sets also changes with the goal: the same ACSM position stand recommends 3 to 5 minutes between heavy sets aimed at maximal strength, and 1 to 2 minutes between sets in the 6 to 12 repetition range aimed at hypertrophy. Resting too little on a heavy set steals strength from the next set; resting too much on a hypertrophy set reduces the accumulation of metabolic fatigue that helps the stimulus.
Example of a weekly split
Two splits cover most goals, depending on how many days per week you train:
| Frequency | Split | How to distribute |
|---|---|---|
| 3x/week | Full body | Monday, Wednesday, Friday. Each session goes through squat, hinge, push and pull, with 2 to 3 sets per movement. |
| 4x/week | Upper/lower | Monday (lower), Tuesday (upper), Thursday (lower), Friday (upper). Allows more volume per muscle group without accumulating fatigue in the same pattern two days in a row. |
In both, each large muscle group ends up trained at least 2 times in the week, within the frequency that the dose response evidence associates with more gain than concentrating the same total volume in a single day.
How to log the load
Without a log, progressive overload turns into guesswork. The minimum to write down on each set is weight, repetitions and how close to failure you got, using RIR (reps in reserve): RIR 2 means you stopped the set feeling you still had two repetitions in the tank. Comparing the same combination of exercise, weight and RIR from one week to the next is what shows whether you actually progressed or just trained. When you hit the top of the planned repetition range with a low RIR in two consecutive sessions, that is the signal to apply the ACSM position stand load increase described above.
The connection with running
Strength training does not compete with running, it supports it. A systematic review with meta-analysis on strength training methods in middle and long distance runners found small to moderate improvement in running economy, the energy cost at a submaximal speed, with heavy load training and with combined methods, and improvement at lower speeds with plyometric training. Running better at the same physiological effort is exactly what running economy measures, and that is why running coaches include strength sessions in the week of anyone training for 5 km, 10 km or longer distances.
Common mistakes
- Switching exercises every session. Without repeating the same movement for weeks, there is no way to compare load and measure real progress.
- Training only what shows up in the mirror. Programming push without pull in the same proportion unbalances shoulder and posture over time.
- Increasing the load every week, regardless of technique. Progression counts when technique is clean; a bigger load with poor technique is injury risk, not progress.
- Ignoring rest between sets. Cutting the recommended rest to save time reduces the load you can move, especially on heavy sets.
How Darwin organizes strength training
At Darwin, the strength plan is born from the same wizard that generates the plan for any sport: you enter availability and goal, and the deterministic periodization engine distributes the weekly split and the load progression. Within each session, the builder logs set, load, RPE and supersets, in the same format described above, with automatic record detection and E1RM calculated in real time, with no need to test 1RM. Those who run and also lift weights see both workouts in the same week, calibrated together by the total load (TRIMP) that the app already uses to adjust the day's nutrition.
