Since there are no options listed to choose from, my best guess would be watches, since a lot of apple watch products are now sold with built in heart monitors.
Turfe did 2 sets of 100 reps :)
Mint Gum has metanol in it which is like a cooling agent and it tricks your nerves into thinking its something cold like an ice cube in your mouth. And then you drink the water, and your brain thinks its extra cold and it just feels like you swallowed alot of ice.
