BRYAN EATON/Staff Photo. Aurelia Kostan, 7, keeps an eye on her wristband heart rate monitor while on a mini-trampoline, one of several excercise stations, during phyical education class at the Bresnahan School in Newburyport on Friday. They were learning about how the heart works and the stations produced different levels of heart rate which the monitors showed: blue for relaxation, yellow for stamina and endurance and red for high intensity.

191122BEAheartrateNewburyportBresnahanphysicalmonitorsDeJordyKostan