SIMMI

Simmi core workout:

Warmup:
:60 wide to narrow squats (can step between or jump between the narrow and wide squats)

Workout:
2 sets of exercises, 2 exercises per set. Take :10-15 rest between each exercise, and :30 rest between sets. 
For each set, alternate between exercise A and B with the following format:
Exercise A: 45 sec
Exercise B: 45 sec
Exercise A: 30 sec
Exercise B: 30 sec
Exercise A: 15 sec
Exercise B: 15 sec

Set 1:
Exercise A: Alternating side planks (on knees or feet)
Exercise B: Heismans

Set 2:
Exercise A: Spiderman planks (on knees or toes)
Exercise B: Pulsing bridges

Stretch:
Supine twist, :30/side