This is an imperative part of your ACL surgical recovery and important to focus on meeting post operative goals, to include decrease swelling, increase range of motion, and relieving the heat (warmth) from the joint.
This should not be completed on your own and it is essential that you work with a Physical Therapist or Certified Athletic Trainer on the rehab exercises and progressions to achieve your post operative goals. Download your PDF based on where you are on your rehab program. During this time it is highly recommended to be in formal therapy guided by a physical therapist or certified athletic trainer.