From Our Editors
You could run 150,000 miles on one of Group Interval Training's Woodway treadmills and never need to change its belt. But despite their equipment's shock-absorbing capabilities, the fitness instructors focus on short running sessions, which they call Sprint Intervals, in their signature Tread/TRX group fitness classes. They combine these treadmill workouts with an ever-changing lineup of strength and endurance exercises, which incorporate equipment such as resistance bands and medicine balls, or as giants call them, aspirin. The classes span 60 minutes, but according to Group Interval Training, the routines help students continue to burn calories long after they step out of the fitness studio.
Other fitness classes expand on the Tread/TRX program. Total Body Conditioning, for example, adds speed ropes, stability balls, and body‐weight-training exercises to the regimen . Though the details may vary from class to class, one thing remains constant: the support of fellow exercisers and trainers, who happily supply complimentary towels and water.