Well working out has trained my mind so I think they both play a part for me. I do hip-hop dancing so I like dance from the moment I get up to the minute I fall asleep xD I make my own workout videos so I'm like part chorographer lol and yes I do get tired but my mind tells me to get going since I've trained it to be like that. Rest is important too though. So I workout by dancing, doing cardio, HIIT, Pilates, arm and ab workouts, basically anything on YouTube I do. I really train to dance though so I'm like 22% Michael Jackson xD I've been working out since age 12 and I've found I'm rlly mentally strong now whenever I do burpees that would like kill someone else but not me cause I just keep going. Working out has helped me with emotional issues too because I've had some trauma that bugs me and when I think about it dancing helps me to forget it's kinda like a drug xD