Respuesta :

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.

CorgiGayGirlForever

Answer:

Crunches as the person said in the comments so give em a thx

Explanation:

k12 and comments :)