To find out how many laps you need to ride each day to complete a total of 76 laps over four days, you can divide the total number of laps by the number of days.
\[ \text{Laps per day} = \frac{\text{Total laps}}{\text{Number of days}} = \frac{76}{4} = 19 \]
So, you must ride 19 laps each day.