Hollow body hold variations:
- Bent hollow body hold - mobility: 5x Cat cow
- Straddle hollow body hold - mobility: 5x Table rock
- Hollow body hold - mobility: Shoulder bridge 30s.

Set and rep scheme:
3x12s, 5x12s, 3x24s,
4x24s, 4x36s, 5x36s,
4x48s, 4x60s, 5x60s,

Stick with one progression until you reach 5x60s. on it.
Move to next progression and start over.