i work many long 14-15 hour days in the kitchen. i just dont have the time to hit a gym before or after shifts like that. so what i like to do instead is push up sets, just outside behind the restuarant. usually sets of 40 or 50. in a long day i can get in maybe 5 sets. along with other simple movements like planks, free squats. usually this stuff can just take 2-3 minutes to do. about the time the other cooks use for smoke breaks. its better than nothing, and pushups are good workout to have in between gym visits.