I try to get my HR up even during strength training by limiting time between sets to enough time to do 15 squats with no weight. Keeps my HR up and moving even during strength training. I also change exercises in order to keep the muscle memory to a minimum. For instance, I was told by a Doc that the shoulder has 18 different muscles and it is impossible to engage them all with one or two exercises. I usally feel really good after I do strength traning and a quick 15 minute spin. Total time is around 45-50 minutes and the commute is 6 steps to my basement.