I did 50 butterfly sit-ups a day for a week — here's what happened to my abs
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Finer Form Multi-Functional Gym Bench for Full All-in-One Body Workout – Versatile Fitness Equipment for Hyper Back Extension, Roman Chair, Adjustable Situp, Decline, Flat Bench : Sports & Outdoors
I do 50 sit ups, and 20-30 push ups every day before bed. Does this do anything for me or should I stop? - Quora
If I did 50 sit-ups in bed each day, how long would it take to grow a six pack? - Quora
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I did 50 butterfly sit-ups a day for a week — here's what happened to my abs
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Develop your six-pack in just six minutes with these…
