Circuit of abdominals

There will be 3 rounds to the circuit, made by repetitions
1ª) 20 iterations on a time 2ª) 15 iterations on a time 3ª) 10 iterations on a time
rest about 30" between times
a Time: 1-Abd.dorsal 2-Lumbar with leg elevation 3-Abd.inferior with leg elevation 4-Upper Abd. with extended legs 5-Lumbar with body elevation 6-Upper Abd. with semi extended legs