Developing stronger abdominal muscles is a worthy fitness goal. Try doing sit ups. You can carry weights if you want to make it more efficient. Your abs are part of your core muscle group, and a strong, flexible core makes other exercises, such as lifting weights, more effective.
Water is your friend. Due to friction, fibers from your muscles give off heat which can dehydrate you. Sweat removes heat but it can also cause dehydration.
Work on your volleyball skills. An unconventional way to
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