Oxytocin is released with physiqcal contact. That warm feeling we get when we hug someone we like for a few seconds longer, that's oxytocin. Did you know that oxytocin is responible for building relationships between people and is reinforced between athletes. For example, when they high five, fist bump or smack each other, it reinforces the bond they share and the commitment they have to work together for their common goal. Next time you are training with your workout partner, make contact to spur each other on!!
Reference - Richard Branson