I have had a fitbit flex, and recently upgraded to a fitbit charge HR because it is more secure for wearing during roller derby.
However, even with the Plum XL, it barely fits on my upper arm, since it is too thick to fit under my wrist guard, and is pointless to wear over my wrist guard. My Flex wouldn't fit over my wrist guard, The XL barely fits. You might not know that the Women's Flat Track Derby Association WFTDA has over 369 teams, and 76 up and coming teams. Many of us use fitness trackers of various variety. There are also men's flat track teams, and also banked track version of the sport. My team has over 40 women comprising 2 teams, and we are a small city in Muncie Indiana, other teams are much larger. This doesn't even count the international teams.
What we need is a very slim version of the tracker, at least 1/2 the height of the Charge, or less if possible, so that it will fit under our wrist guards, so it can still track heart rate, but is protected in case we would fall. When it's on your upper arm, if you get hit, it can go flying. With my arms, the Plum Xl will fit on the last notch, not securely... Maybe you can just make an extender strap for all models so women with beefy arms can wear it on our upper arms. This website has a version of the wrist guard that I use, and most of them are very similiar... it would be nice if you made a tracker that maybe was a wrist guard, removeable fitbit electronics to be charged or washed, and able to buy replacement parts fairly cheap, as you go through a set of guards once a year. http://www.6pm.com/triple-eight-rd-wristsaver-black?zhlfid=139&kpid=27065384 But, you know something that could integrate into a helmet would be nice too. But honestly, thin, flexible, and with a long enough strap to wear on upper arm, ankle, or under/over the wrist guard would be perfect. Honestly something as thin as a piece of gum would be great. Roller derby should be on the exercises as well.
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