In school we are now doing PE every Wednesday. Try to do an hour of physical exercise at least on a Wednesday as well as keeping active throughout the week. You can do this any way you choose, walking, cycling, running etc. There is also Joe Wicks every morning if you want to join his workouts.
Below is a link to Youth Sport Trust. Please scroll down to the Health Related Exercises section and complete the Circuits 1 - Feeling Flexible lesson. There is an activity card and video for you to follow.