You will need a pool noodle, or a floating device to perform this 10 minutes deep-end routine. The series of exercises included in this routine are a combination of leg tucks in different positions and body swaying. That aims to engage your core muscles to the fullest.
Noodle or a floater is vital here for isolating other muscle groups and focusing on the targeted ones only. By resting your hands on the noodle and relaxing your shoulders, focus on only using your core muscles.