Crunches
In my educated opinion, crunches would be the best choice out of these options to build strength. A one mile run builds cardio, sit and reach and gymnastics build flexibility and some strength, crunches is strictly abdominal strength.
Answer:
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Atrophy, hope this helps :)
External abdominal oblique, internal abdominal oblique, transverse abdominis, rectus abdominis.
The answer is all of the above
