« Mental and physical progression go hand in hand, and they compliment one another. The drive and ability to deal with stress in competition […] does not come from sitting on the couch. As most athletes know, it is accumulated and built-upon each time you lace up your shoes, hop on the bike, or get in the pool. You train yourself to be mentally tough by putting in the work and suffering through workouts. And with that training comes new physical achievement… and with that new physical achievement comes new expectations… and with those expectations comes more training, more suffering, and more mental toughness. […] The two are inextricably linked, and that is what proves to be the difference, even when it’s ever so slight, between elite athletes. » — Sean in DC