Personal Health Investment Today Act or the PHIT Act This bill amends the Internal Revenue Code to allow a medical care tax deduction for qualified sports and fitness expenses. The deduction applies to amounts paid for: (1) fitness facility memberships, (2) physical exercise or activity programs, and (3) safety equipment for use in a physical exercise or activity program. The overall deduction is limited to $500 per year (twice the amount in the case of a joint return or a head of household), and a deduction for safety equipment may not exceed $250. The bill requires the limits to be adjusted for inflation after 2019. The deduction does not include expenses for golf, hunting, sailing, horseback riding, and videos or books.