Once a month, you can lob and smash and gracefully (okay, maybe not so gracefully) leap over the net after a winning match for FREE. The Gates Tennis Center holds a FREE tennis clinic every month for adults (15 and older) on Saturdays from 5 p.m. to 7 p.m. All levels are welcome and you can bring your own racquet or rent a demo. Children are welcome to attend as well and spend time with a kids instructor. Limited spots are available and you are limited to two free clinics per person per season. You need to reserve a spot by calling 303-355-4461. Reservations for each clinic open one week prior. The next date is August 1, followed by September 5, October 3 and November 7. 3300 E. Bayaud Ave., Denver.