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If you're looking for a way to strengthen your abdominal muscles, try crunches. They're a lot like sit-ups, but instead of lifting your entire back off the floor, you only lift your upper back. This isolates ("crunches") the abdominal muscles without engaging muscles in your hips. Once you learn to do basic crunches, you can also try reverse crunches, twist crunches, side crunches, and cable crunches.最新版本1.0更新日誌
Last updated on 2019年04月07日
Minor bug fixes and improvements. Install or update to the newest version to check it out!
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How to Do Crunches
1.0 by NonitaDev
2019年04月07日