Garmin recently released a series of firmware updates for several popular training devices that has been seldom reported on, but may mean a great deal to some, depending on the equipment you own. About two weeks ago Garmin allowed third-party vendors to write data from their devices to Garmin’s native FIT files. This is going to have big ramifications for endurance athletes that like to self-quantify their training and use some of the newer devices on the market. Where it will make the biggest difference is for athletes using running power meters and blood/muscle oxygen sensors. Currently, blood oxygen sensor companies seem to be the only ones using the opening.