I have a love/hate relationship with mountain climbers (the ab exercise, not folks that climb mountains for fun!) — on one hand, they are a killer compound exercise that works your core, shoulders, back, hips, quads, and glutes with just your bodyweight. On the other hand, these hurt, and there’s a reason why I’ve put off this challenge for so long! But, in an attempt to really get to know the move, I unrolled my yoga mat, and decided to add 100 mountain climbers to my daily routine.