A fellow LCHF researcher had told me that he does a 3x full body and does his cardio on off days, just lifting every other day. I've always gone hardcore, work everything to exhaustion, etc... but that's one of the perks of a split (be it 3 or 5 day). you may be lifting almost every day, but each muscle group gets a full week to rest. Example, if I do a full body then I am working all muscle groups every other day instead of 7 days of rest.