How about combining pixel-addiction with exercise?
If I had a treadmill, I'd set it up in front of my computer (or just get a Trek Desk) and only allow my character to walk/run if-and-when I am walking/running on the treadmill.
Yea yea fat fingering keys while bobbing up and down running could be problematic. You'd probably need a really big TV screen to plug into as well. It could be dangerous, but at the very least it would be hilarious to try (and film if anyone would so-dare)!
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