(Tip: No sliders?
Fuzzy socks on a wood floor work just fine).
This one is tricky, but you only have a few reps here.

For your plank-jack, you will quickly slide your feet away from each other and draw them back together.
Crunch with toe-tap:Now, you get to lie on your back and give those shoulders a break.
Slowly, tap one toe at a time down to the ground and bring it back into tabletop.

…
Hollow hold:Time to really tap into your lower core here.
Thenremembering to breathepump your arms up and down quickly.
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