This gives you the low end of your training zone3 Do the same calculation again, but use( .65) rather than( .5) to calculate the highendYour final training zone may look something like 130-150 beats per minute, just for an example.
While we can use invisible ink to print on the Bicycle paper playing cards, for example, we can mark the invisible ink markings on the back of playing cards,the markings won't be seen by naked eyes, they just can be seen by UV invisible contact lenses and UV sunglasses.
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