what about a stationary bike? Very little head movement or risk of falling. I completely understand what you mean about feeling gross and lethargic. Its hard when you are an athlete and used to being so active. I also do exercises at home with resistance bands, a big ball, and foam roller. I use the bike or elliptical in my complex gym. Its not much, but it keeps my muscles moving. I get dizzy from all the stimulation at my real gym, so keeping it at home, i can rest immediately if i need to or if i need my headache meds.