To find out how many sit-ups Patrick did in total, we can multiply the number of sit-ups he did per day by the number of days he did them.
Patrick did 10 sit-ups per day for 7 days:
\[ 10 , \text{sit-ups/day} \times 7 , \text{days} = 70 , \text{sit-ups} \]
So, Patrick did a total of 70 sit-ups.