Stand more, sit less. Stretch frequently, and do the basic calisthenics: pushups, unweighted squats, crunches, maybe even burpees. Don't do a bunch of reps, ju

Stand more, sit less. Stretch frequently, and do the basic calisthenics: pushups, unweighted squats, crunches, maybe even burpees. Don't do a bunch of reps, just 5-10 or whatever is comfortable, every couple hours.