Our sprinting boys like to do the following routine now and then
once warm-up
wide reverse grips
1 x maximum weight (for me thats 50kg around waist)
2 x 45kg
3 x 40kg
5 x 35kg
6 x 30kg
8 x 25kg
9 x 20kg
10 x bodyweight
work in pairs – rest time = time for your partner to do his set and weight adjustment
trimming off basically 10% on max each time
its hard at least on my old bones! But a great favourite for some challenging variety