When people train just one leg with heavy weights, their thigh muscles get bigger and stronger—and this method works well for studying how different rest times affect muscle growth.

If you're lifting heavy weights, you don't need to push to absolute exhaustion to grow your muscles—stopping just before failure works just as well, as long as you're lifting heavy enough.

For small muscle groups, unilateral and bilateral resistance training produce equivalent hypertrophic adaptations when volume and effort are matched.

If you're a young guy lifting weights, your muscle growth and strength gains might be easier to predict if you treat big multi-muscle exercises (like squats) differently in your workout plan than isolated moves (like bicep curls).

If you're new to lifting and using light weights, you need to push your muscles until they can't do another rep to grow them bigger—otherwise, even doing more reps won't help.

Lifting weights slowly (eccentric) or quickly (concentric) both make your quads stronger in about 10 weeks — and you don’t need to be sore or damaged to get stronger.