Balance on a chair

There’s a whole world of active sitting chairs that let you bounce, rock, sway, or integrate some other form of movement to help you get fit while you sit, says Dr David Skolnik. Yoga balls are a popular choice, requiring you to keep your core tight the whole time you sit.
Try a standing desk

Standing desks and their more intense cousins treadmill desks are popular for a reason: they allow you to keep moving while being productive at work, Skolnik says. Not ready to commit to a whole day on your feet? Try a standing desk converter, which allows you to sit or stand.
Do calf raises while waiting in line

Ballerinas have gorgeous calf muscles, largely due to how many relevés (calf raises) they do. But you don’t have to be a dancer to do the simple movement. In fact, unlike squats or burpees, this exercise is so unobtrusive that you can do it anywhere you’re standing still, like while you’re waiting in a line, says pilates educator, Tianna Strateman.