“Beginners should wait longer, but more-advanced gymgoers should go for the burn, waiting only 30 seconds between sets.”
“In that experiment, healthy adults walked backward downhill on a treadmill for 30 minutes, courting sore muscles and curious stares from fellow gymgoers.”
“For gymgoers looking to build strength and fill out their T-shirts, poor form or technique can turn shoulder workouts into a fast track to physical therapy.”