Now that spring is here, are you yearning to trade in Zoom for Zumba? Craving more downward- facing dog and less TV-facing with your dog? There are lots of outdoor exercise classes being offered this spring - in the city and the suburbs. Some classes are free, some donation-suggested and others charge admission. Most require registration. Schuylkill River Banks Yoga on the Banks, a donation-based class, is back at the Schuylkill River Banks. The class meets at the 25th & Locust entrance on Saturdays and Sundays at 10 a.m. and Thursdays at 6:30 p.m. All levels are welcome and registration is necessary. Masks are required.