I highly recommend this 7 Minute workout app. It has had over 3 million downloads. There was plenty of science in designing this program and there has been great success stories. No weights or equipment is needed for these 12 exercises. (12 exercises for 30 seconds each with a 5 second transiton period between). Try a circuit or 2. Customize your own program. Not only great for physical exercise but for emotional health during these times.