Hi Jill. Haven’t been running, but have been mountain biking in lady mode. Corset, breast forms in a bouncy bra, gaff, wig, and light makeup. It was a rush! Was wearing a light T-shirt the first time, and a camisole the second time. Wore my really short girly bike shorts. It feels wonderful – I felt so much more exposed and somehow free. And the feeling of the boobs bouncing as I rode over the rough spots, and my long hair brushing against my shoulders as I rode. Total rush! Got to do that more often!
I would think running would be similar, just less random bouncing! You do have to wear enough of a bra to make sure the girls stay located though. Have fun!