After a tough squat workout, both younger and middle-aged guys who regularly lift weights show similar drops in their ability to fully activate their leg muscles — and that drop lasts for at least a few days. This suggests that brain-to-muscle fatigue from hard workouts doesn’t get worse with age if you stay in shape.

Middle-aged guys who lift weights don't bounce back as quickly after a tough leg workout as younger guys do — they're weaker and less powerful for a few days, even if they're just as trained.

You might not feel stronger right after this training, but your strength keeps going up for weeks after you stop — the best gains happen when you’re resting.

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.

After doing hard leg pushes with 5-minute breaks, people’s muscles stay stronger and more activated afterward than after 2-minute breaks, meaning they don’t get as tired.

After doing hard leg pushes, people who rest 5 minutes between sets lose much less strength than those who only rest 2 minutes.