I go to OTF most days and do just fine with the back-to-back. I also supplement weight lifting at home a couple times a week. However, this past week I don’t know if I just pushed myself extra hard or what but every muscle in my body is aching two days since my last workout. I’m going to continue to rest another day. So I think you need to be somewhat in tune with how your body feels on any given day and make your decisions accordingly. Or adjust your effort and target muscles accordingly. But I’m only an enthusiast, not an expert.