Four Weeks ago I started doing HIIT on an exercise bike. I do 7 minute warm up. Then 9, 30 sec high intensity burst in between 2 minute recovery intervals. I'm now able to go max effort for 30 seconds straight. By 30 second mark, I can't move my legs but I still keep the RPMs at around 90 during the recovery interval. I require a full 48 hours of recovery time. when will I be able to do low intensity exercise on the exercise bike on my recovery days? in only a month I've noticed a small increase an endurance and strength in my legs and my lungs. I love exercise so much I really wanna be able tI do it everyday.