Cassidy Thompson on MSN
Ab challenge: 200 mountain climbers, 100 sit-ups & more – crush your core!
Take on this intense ab challenge to strengthen and tone your core before the new year! Complete 200 mountain climbers, 100 sit-ups, 100 Russian twists, and 100 side-to-sides in this full-core workout ...
"The results were bigger than I expected." ...
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