This challenging workout is a great routine on its own, but also works as a second leg day in the week if you're trying to grow. Two leg days, plus extra calories from a weight gainer, is a time-honored way to see muscle growth from head to toe.

Machine Pump Leg Workout
1
Leg Press
4 sets, 20, 15, 10, 10 reps (rest 90 sec. )
2
Smith machine back squat
3 sets, 10, 15, 20 reps (rest 90 sec. )
3
SINGLE-LEG LEG EXTENSION
Perform all of the reps on one side before switching to the other side. Rest as little as possible between sides and sets.
Single-Leg Leg Extension
10 sets, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1 reps (left side, no rest)
Single-Leg Leg Extension
10 sets, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1 reps (right side, no rest)
4
Seated Leg Curl
After the final set, perform a single dropset.
3 sets, 10 reps (rest 45 sec. )
5
Seated Calf Raise
Perform 100 total reps with a weight you can handle for 15-20 reps without resting, taking short rests as needed to reach the full 100.
1 set, 100 reps
Workout Legs