Gym on Yik Yak | My lack of core development ruins my already mid (but acceptable) physique. Any tips on working core well?

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My lack of core development ruins my already mid (but acceptable) physique. Any tips on working core well?

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Anonymous 14w

Cable crunches

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Anonymous 13w

Cable or machine crunches done twice a week for 2-3 sets taken close to failure

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