Healthy Food Chart

So not exactly diet related, but I've been changing my diet for the better for the last two years so I'm fairly comfortable with that.

However, recently I hurt my knee at Taekwondo. Since then, I have not been able to go to my Taekwondo or dancing class, and I haven't yet gone to the gym (though I'm planning to get back to that very soon even if only to weight train my upper body).

Anyway, even push-ups are difficult to do because of the pressure they put on the legs, let alone squats or lunges or anything like that. And crunches only go so far. Does anyone have any ideas for some exercises I can do while my knee heals?

I'm going stir crazy and gaining weight so as you can guess, I'm not happy about my current situation, and without the endorphins, my emotions are going crazy.

Please help.