Tempo Front squats Strength

3x5reps @ starting about 60% of 1 rm and go up as you feel.
Tempo is 42X2
4sec down, 2sec at bottom, explode up, 2 sec before starting new rep.
rest 2-2,5 min after each set. (perfect squats/control of weight)
Time limit 20minutes for squats including warm up sets.