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At 90, former Broncos aerobics instructor who trailblazed fitness holds final class

One of John Gillingham’s signature exhortations to spur folks who have adored his exercise classes for generations is, “There is NO stopping.” But now there is.

Gillingham retired after 63 years in the exercise industry on June 2, his 90th birthday, leading one final workout for more than 60 longtime friends on a gorgeous Saturday morning in a park near the Denver Tech Center. They did hill sprints and bunny hops with balloons between their legs, step-ups while blowing “birthday whistles,” wall-sits while holding cupcakes in spoons. They huffed and puffed through squats, lunges, push-ups, sit-ups and a lot of laughs.