Re-set the Cardio input options so you can set a time AND a HR zone eg 30 seconds at 90-100% HRmax
For programming interval training, we need to be able to offer guidance on time as well as intensity levels eg sprint at 90-100% HRMax for 30 seconds then jog for 1 min at 70-75% HRmax. Your current settings only allow you to set either time OR HR zone.
Rob Yontz commented
YES!!! Thanks Kate, nice to see someone else who knows how and actually does HR training vice tracking.