The same combination of cortisol and dopamine, released and combined in the
brain during physical exertion, helps us find a true sense of satisfaction from digging a ditch.
Amino acids that come from consuming protein are an essential part of the canine diet, making up 5 - 15 % of the energy used by the
athlete during physical exertion.
Sweating is a natural function of the body to cool it down
during physical exertion or from a warm environment or to even help cope with emotional situations.
While the laws of thermodynamics tell us that this is true, there's much more to weight gain than consuming more calories than you use up
during physical exertion.
Maximum heart rate (HRmax) is the highest number of heart beats per minute (bpm)
during physical exertion.