Males get very aroused around their partner they find sexually attractive and the male sex hormone known as testoterone is going crazy. If you want a more specific answer I'd reccomend researching the male anatomy.
When Working Out In Exercising in hot weather puts extra stress on your body. Wind chill extremes can make exercising outdoors unsafe even with warm clothing. Exercising in cold weather increases the risk of hypothermia
False race walking means you must have one on the ground