I have started using the Workout Trainer app on my days off of running. I have been trying to alternate upper, lower, full and core workouts on each day off but after my lower body workouts my thighs just can't take the running/jogging the next day. Anyone have any tips for this? Is it just that my body needs to get used to it and Should I just push through and run anyways? Yesterday I did an hour of lower body and was only able to run a mile today ( with walk breaks).