Doing a special warm-up before lifting weights lets you finish your workout faster while still building just as much muscle.

Doing single-muscle exercises first makes you tired, so you can build muscle with lighter weights on bigger exercises.

When you tire out a muscle with one exercise before doing a bigger workout, you can't do as many reps in the big workout, so you end up doing less overall exercise than if you just did the big workout alone.

Pre-exhaustion training makes your workout sessions about one-third shorter than regular training methods.

Doing a light warm-up set before lifting heavy weights might help you build more muscle and get stronger, according to some research that tried a similar but different approach.

When you do a special workout called pre-exhaustion, you get tired faster and end up lifting less total weight compared to regular workouts.