If You have overweight and You are beginner You must try these low impact training. You can burn 300 calories under 20 minutes. You have to do 8 exercises, every exercise You do 40 seconds and 20 seconds rest and You do 2 sets. These exercises are: Tip toe squat, Low impact burpees, Sumo squat and heel touch, Kneel to squat, Standing crunches and kick, Knee pushup and tap, Reverse crunches and Plank.