To find the unit rate of push-ups per day, you divide the total number of push-ups by the total number of days.
So, for 62 push-ups in 2 days:
\[ \text{Push-ups per day} = \frac{62 \text{ push-ups}}{2 \text{ days}} = 31 \text{ push-ups per day} \]
Thus, the unit rate is 31 push-ups per day.