How to get stronger: the practical guide (strength vs hypertrophy)

Strength vs hypertrophy: not the same thing

Strength and hypertrophy are often confused, but they are different adaptations. Strength is the ability to produce tension and move weight: it depends on muscle size but also — and a lot at the beginning — on your nervous system, which learns to recruit more fibers and coordinate them better. Hypertrophy is the increase in muscle size. They overlap (a bigger muscle can be stronger, and strength training grows muscle), but they are trained with different emphases: strength calls for heavy loads and long rests; hypertrophy, more volume in medium rep ranges.

Progressive overload: the engine of everything

If you take away one idea, make it this one. Progressive overload means imposing an ever-greater demand on the muscle over time: more weight on the bar, one more rep with the same weight, or one more work set. As Schoenfeld (2010) summarizes about the mechanisms of adaptation, the body only changes if you give it a reason to change. Repeating the same weight and the same reps forever is the number one cause of stalling. The only way to guarantee progress is to keep a log of your sets and look to improve something every week.

How many reps and how much weight

For maximum strength, the classic range is 1-6 repetitions with loads of 80-90% of your max (1RM). The meta-analysis by Schoenfeld et al. (2017) is clear: heavy loads produce more strength than light ones. For muscle size, on the other hand, both heavy and medium loads work if you take sets close to failure. A practical guide to ranges:

• Maximum strength: 1-6 repetitions at 80-90% of 1RM.
• Strength + size (the most useful for most people): 4-8 repetitions at 75-85%.
• Hypertrophy: 6-15 repetitions, close to failure.
• Muscular endurance: 15+ repetitions (little transfer to maximum strength).

The exercises that build strength

Strength is built on compound movements: those involving several joints and a lot of muscle mass. The squat, the deadlift, the bench press, the overhead press, the row and pull-ups are the backbone of any strength program. Isolation exercises (biceps curls, extensions) have their place for size and weak points, but they are not where real strength is earned. If you are starting out, learn the technique of the basics with the gym routine for beginners.

Rest: longer than you think

To gain strength you need to rest more between sets than most people do: 2-5 minutes. The study by Schoenfeld et al. (2016) showed that long rests let you move more weight in the following sets and produce more strength and even more hypertrophy than short rests. Rushing to finish with 30-60 second rests works for muscular endurance or sneaking in cardio, but it sabotages your strength. Give your nervous system the time it asks for.

Frequency and progression models

Training each movement pattern 2-3 times per week usually pays more than a single crushing session, because strength is also motor learning: the more you practice a movement, the better you execute it. To progress, the ACSM position (2009) recommends clear models: linear progression (adding a little weight each session) works very well for beginners; later on, double progression (first add reps, then weight) and periodization make sense. And every 4-8 weeks, an easier week ("deload") to recover and keep climbing.

Nutrition and rest for strength gains

Strength is built outside the gym as much as inside it. You need enough protein (1.6-2.2 g/kg per the meta-analysis by Morton et al., 2018) to repair and build muscle, adequate calories (at least maintenance; a small surplus accelerates gains) and 7-9 hours of sleep, because the nervous system recovers while you sleep. Creatine is the supplement with the most evidence for strength and power (see the creatine guide). And do not neglect rest between sessions: rest and muscle recovery are when you actually get stronger.

How to measure your strength

You cannot improve what you do not measure. The simplest way is to log the weight and reps of your main exercises session by session: if you move more over time, you are gaining strength. To compare across exercises or set training percentages, estimate your one-rep max (1RM) from a set with the 1RM calculator. And remember that progress is not linear: there will be weeks of stalling and weeks of jumps; what counts is the trend over the months.

Gaining strength is, above all, consistency with progressive overload and with recovery — training, eating your protein and sleeping, week after week. Renzy helps with the nutrition side: you photograph your food and instantly see whether you reach the protein and calories your strength needs, without weighing anything or writing anything down. With the food base under control, all you have to focus on is moving the bar up.