The core never gets enough credit for the work it does on the run. But without a stable center, you’d not only run with hunched-over posture, low back aches, or knee pain, but you’d also waste a ton ...

No sit-ups or regular plank holds in sight ...

Hint: You can’t really go wrong—but your goals can point you one way.

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When I first started running, I thought a solid core workout looked like blasting through some crunches and sit-ups and then checking for any signs of visible ab definition. It turns out I had core ...