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 ...
The mountain climber is a core training staple that can help build a strong core and get you moving, but are you sure you're even doing the exercise correctly? For this movement, you shouldn't settle ...
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