The main disadvantage is the work in the pool. I watched both videos and reviews, everywhere they said that this is an ideal option for the pool. This is not true. Writes heart rate only before entering the water and after (see screen). Out of the water it works perfectly and suits everyone. Heart rate control training is a must to avoid overtraining, stress on the cardiovascular system and achieve endurance and fat burning goals. So keep in mind that in the pool he will most likely let you down.
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