What is your maxium heart rate?

220 minus your age. Therefore if you are 30 220-30=190 However there are various other methods of calculation. It also depends on what exercise you are doing and how fit you are already. check out this website. in US Navy SEALs heart rates above 200bpm have been measured on EKG. at rates this high the SEALs were able to wire explosives and discharge there firearms, but were unable to do en simple math problems i.e. 2+2=4. This zone is known as the red zone