Gym class should be manditory every day school is in session. Students should be taught the health benefits of exercise and how it will improve the other parts of their lives. More importantly, encourage them to find activities they will enjoy and will keep on doing.
Back in my HS years (late 70's) intramural sports activities were always going on during the lunch hour. Anything from basketball, floor hockey, etc was open to any student who wanted to play.
The biggest hinderance to attaining the above is computers, social media etc. Having grown up in an age where computers weren't around we spent most of our time outdoors doing some sort of physcal activity.
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