Anonymous

Get one of those apps on your phone that gives you a series of exercises to do.

Anonymous

Pilates is a great workout. Also, old fashion calisthenics (pushups, situps, jumping jacks, squat thrusts, etc.) is great for getting in shape, although it doesn't really build strength like pilates will.

Anonymous

Planks, pushups, lunges, squats, running in place. Just those will get you started.