Workout 4
3 rounds of 50 seconds on, 10 off
Lateral steps
Walk outs
Jumping Jacks
Bird-dogs/dead-bugs
shuffle/twist
Plank
Climbers
Go through each movement for the duration of the time you can commit to. Move to the next exercise; 7 exercises is one full round. Go through this 3 times total.
Substitutes:
The best way to substitute this is to work less, and rest more. However you change the rest time, aim to keep the clock at one minute. For example, 20 seconds of work and 40 seconds rest, 30-30, 40-20, etc. Doing the best you can for the longest you can will work on building your endurance!