So, armed with the plank drag, or plank pull-through as it's also known, I recommitted myself to seven more days of core work — 90 reps a day. Here’s what happened to my abs. You may like ...

How to Do a Plank With a Dumbbell Pull-Through. Start resting on all fours with a medium-weight dumbbell — 10 pounds is a good starting point — on the left side of your body.

The plank pull-through is one of Sims's favorites because it is an antirotation move (you're trying not to move your core as you pull a weight under and across your body). Antirotation, she said ...

Bear plank push through x 16-20 total; High plank pull through x 16-20 total; Pull over crunch x 12-15; DB hollow hold with large flutter kicks x 20-30 total; ...

Plank drags are a moving plank variation that activates the same muscles and uses a side-to-side pulling motion to work your arms and back. We did 90 reps a day for a week.