I usually eat a lot of icecream sandwiches, play online multiplayer games, and nap a lot to stay sharp.
When I'm really motivated I will watch a whole season of the Saprano's in one sitting. Usually polishing off a box of Klondike bars while doing so.
To keep my timing, I usually will do jumping jacks while taking a piss, doing my best not to miss.
This also knocks out two birds with one stone becuase the jumping jacks are my cardio for the day.
For strength training I will only use one finger to open my pepsi and two fingers to open my bag of potato chips.
For my power training I usually change my cloths on Wednesdays and take a shower.
On a more serious note.
I would still attempt to roll once a week regardless of your commitments. Nothing replaces mat time.
Running is the king of cardio. I fkn hate running, tried everything else, but in the end running works the best for me.
Lifting augments everything. One body part per day, 3 different exercises per body part.
Or full body workouts every other day, high rep, low weight. You can alternate these routines every 6 weeks.
Stretch. Stretch twice a day. It will help cut down on the injuries when you come back.
I don't think instructionals are best during a layoff.
You can't practice anything while your off. Then when you come back you are trying a bunch of sh*t that you don't really know, get frustrated and demoralized.
It's better to just watch competition footage like "on the mat" etc. to keep your brain working but not confusing it.
Two things you get unaccustomed to on lay offs. The weight on your body, and broken breathing patterns / smoothering. Don't really know what to do about that unless you hire a fat ass hooker...lol