What the research says about lifting
Plain-English summaries of the evidence on training and nutrition, each backed by the most cited peer-reviewed studies. Educational content only — not medical advice.
Caffeine →
Caffeine is a well-studied performance aid. It modestly improves strength, power and muscular endurance and lowers perceived effort.
15 studies reviewed
Creatine →
Creatine monohydrate is the most researched sports supplement. Meta-analyses consistently show it increases strength and lean mass gains when combined with resistance training, with a strong safety record in healthy adults.
15 studies reviewed
Deloads and periodization →
Periodization organizes training into phases, and deloads are planned lighter periods. Structured plans tend to beat non-varied training for strength.
6 studies reviewed
Progressive overload →
Progressive overload means gradually increasing training demands over time. It is the core principle behind long-term strength and muscle gains.
12 studies reviewed
Protein intake →
Protein intake drives muscle repair and growth. Research points to a daily total of about 1.6 g per kg of bodyweight as the point where extra protein stops adding measurable muscle gains for most lifters.
14 studies reviewed
Rest between sets →
How long you rest between sets changes how much work you can do. Longer rests let you keep weight and reps high, which tends to favor both strength and muscle growth.
10 studies reviewed
Sleep and recovery →
Sleep affects hormone levels, recovery and training performance. Sleep loss is linked to lower strength and impaired muscle recovery.
13 studies reviewed
Training frequency →
Training frequency is how often you train each muscle per week. When weekly volume is matched, frequency has a small effect, so it is mainly a tool to spread volume.
4 studies reviewed
Training volume →
Training volume (sets per muscle per week) is one of the main drivers of muscle growth. More volume generally produces more growth up to a point that depends on the individual.
4 studies reviewed
Warm-up →
A good warm-up raises muscle temperature and prepares the nervous system. Specific warm-up sets with the lift you are about to do improve performance.
13 studies reviewed