If you do a practice and train your attention to hover in the present, then you will build the internal capacity to do that as needed - at will and voluntarily.
The ability to handle stress increases with the practice of meditation. In a culture like ours in which inner, spiritual growth is totally neglected in favor of materialistic pursuits, we might have something to learn from the Hare Krishna devotees' meditational practices.
What seems to set apart those at the very top of competitive pursuits from others of roughly equal ability is the degree to which, beginning early in life, they can pursue an arduous practice routine for years and years.
Daydreaming defeats practice; those of us who browse TV while working out will never reach the top ranks. Paying full attention seems to boost the mind's processing speed, strengthen synaptic connections, and expand or create neural networks for what we are practicing.
The more time you put into practicing, then, the greater the payoff.