Rest days are the best way to get the most use out of PEG MGF, as you will have lower level of IGF-1 and the long lasting PEG MGF will have the ability to run the course of the body while you focus on recovery. I have personally ran PEG MGF and administered into the quad regions after very long sessions where my quads were ripped to shreds. The recovery time and muscle growth in those areas was noticed after one week of use. Duly noted was the recovery time after a 100+ mile ride. On the recovery day, I administered 200mcg of PEG MGF and rested. The following day muscles felt recovered and soreness was not present for the next training ride.