I do them during a muscular endurance phase that I slot in between seasons. The workout usually has step ups, step downs, squat jumps, and split jump squats. All four are on time rather than reps. I'll start with some active stretching and follow the ME with a really short, easy run. I cut back on hill/intensity running workouts during that phase so I can still recover and do my distance workouts. I use a Rogue box and a plate vest from Kensui. Makes it easy to add 10% each week throughout the phase. It's all Training for the Uphill Athlete type planning.