Ladder Circuit: 50 mountain climbers (left and right is one) 40 squat jumps 30 crunches 20 lunge jumps 10 push-ups. Pull-ups/Burpees Circuit: 5 pull-ups ...

One crucial thing is, that if the programme goes bananas, the push-button must also reset the microcontroller – a PIC12F629. Luckily, the processor is not too busy, just clocking around a state ...