I tend to use around 40% of max 1RM back squat to start with and then increase or decrease based on feedback from player and also a visual on explosiveness from me we will use more Tendo unit to be more specific with the load also 1/4 squat I will wave from 60 – 70 – 80% of 1RM back squat due to the short range of the movement, but again this is just a start point for you and then you can change as you see fit from talking to player and observing, cheers, ash