Here are some things we’ve done..
seeing how long it takes for the muscle groups in our arms to wear out… They made it about 4mins and 30 seconds.. 
learning about the different muscle groups that are at work when we do jumping jacks… and if the muscle in the shin plays a part in the effort…
learning about the different muscle fibers, cells, and energy production… 
building an arm… 
we needed long balloons for the muscles but I only had the round kind in our craft bin… So no muscles on this arm… and finally a working arm with triceps and biceps…
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