The Apple Watch is one of the best smartwatches on the market. There are also plenty of tiny wearables you can rely on to monitor your workout on a daily basis. Some of us prefer making our own wearables though. The MetaWear COIN can help. It is a Bluetooth board for DIY wearable projects. This coin-cell powered sensor platform has motion sensors and a case, allowing you to get temperature data, log motion data, and more on the go.
The developers are making a SDK available for the board, so you can come up with custom solutions for it. The SDK is available for iOS and Android devices. MetaWear Coin runs up to 6 months on a single coin-cell battery. You can find out more on Kickstarter.