🚴 Cycle Science Start Challenge

In partnership with the gym teacher, students rotate through stationary bikes in the gym for a timed 2-minute ride. Before and immediately after biking, they measure heart rate (15-second count ×4) and breathing rate using stopwatches and tally charts. Back in class, students create a quick class bar graph on chart paper comparing resting and post-biking averages and discuss surprising patterns and changes they notice.