People tend to check in during these times:
The 2006 renovation of North Grounds Recreation Center adds a new dimension to sports and fitness for IM-Rec Sports members. Strategically located within easy walking distance of the University Law and Business schools.
Parking is also free before 7:30 am. Yawn.
And by knees I meant legs. No one wants to sprain their back at North Grounds.
Parking is free after 5pm but if you drive over during the day then don't forget to check the number on your space and pay at the machine inside. They love to ticket. Also... lift with your knees.