saint72

Ok I got the Polar fs3 seems pretty good so thanks for the advice there Jock. I have managed to find 2 different formulas on heart rates but I am a bit confused which is the one I should be using.

Formula 1
220-35 x 0.65 = 120 bpm 65%
220-35 x 0.70 = 129 bpm 70%

Formula 2

Using this other formula I found you can see there is quite a difference.

(max - resting) x 0.65 + resting = 65%
(max - resting) x 0.70 + resting = 70%

for example we'll use my heart rates
my resting is 66 beats per minute
my max is 185 beats per minute
so
(185 - 66) x 0.65 + 66 = 143 bpm 65%
(185 - 66) x 0.70 + 66 = 149 bpm 70%


As you can see 2 very different results? be very greatful for any advice :crazy: