Max thruster
take your time find your max thruster
then:

3 rounds
12 thrusters unbroken (reduce max by 30%)

every round that you are unable to make 12 thrusters x the number remaining by 3 for burpies
eg. 9 thrusters completed so 3 remaining x 3=9 burpies

after 3 rounds of thrusters do burpies