a. 3/4 of your bodyweight anyway overhead
b. chest to ground pushup

c. jumping pullup

a. 1-2-3-4-5-4-3-2-1
b. 2-4-6-8-10-8-6-4-2
c. 3-6-9-12-15-12-9-6-3

do a,b,c round 1 then abc round 2 etc.
for example round 1 is 1 anyway overhead, 2 chest 2 ground pushups 3 jumping pullups. round 2. 2overhead 4 chest to ground 6jumping pullups ...