Doing slow, low-effort weight training three times a week for 12 weeks can make your thigh muscles bigger and stronger, just as much as doing fast, high-effort weight training.

Doing gentle strength exercises slowly and steadily twice a week for 12 weeks makes older adults' knee muscles stronger.

Doing gentle strength exercises slowly and steadily twice a week for 12 weeks makes older adults' leg muscles stronger.

Lifting light weights at a normal pace three times a week for 12 weeks doesn't make muscles bigger or stronger in young men, even if you do the same total amount of work as other exercises.

If overweight guys in their mid-30s do a short but intense weight training routine three times a week for six weeks, they can boost their leg strength by nearly 27%—showing you don’t need long workouts to get stronger fast.

If you lift light weights super slowly and hold the tension, your thighs get stronger and bigger after 12 weeks—but if you lift the same light weights at a normal pace, you won’t see much change.