Six sets of virtual life goggles...
If you don't need Athletics for a supermax, make them all go jogging. Line 'em up, pick a spot on the map far, far away, and just check on their progress occasionally. They'll probably get fatigued and stand around doing nothing before they actually get where you sent them.
Have them learn instruments. Pretty much anyone will participate in a jam session until they're ready to starve or pee themselves.