A lot of activities will change your hormonal balance for the better or worse. Entering into conflict-like situations can and does increase adrenalin and cortisol and other stress hormones. Then you face adrenalin withdrawal and crash later. Of course, we basically are biochemistry, so significant changing of hormonal balance affects a lot of our body – immune system, respiration, digestion, etc. A lot of people are aware of this kind of peripherally, but there hasn’t been much discussion about the hormonal-altering costs of a lot of activities.