Upside-Down Crunch
1)Start on ground in plank position, balancing on forearms and toes, hands clasped, so body forms a straight line from head to heels.
2)Tip tailbone up, arching back slightly, then tuck pelvis under, reversing arch to flatten back and pull abs tight; hold contraction for 5 counts.
Do 8 to 10 reps.
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