Demonstration model: iPhone12&; & Huawei P40 &;; & Xiaomi 1 1 system version: IOs14.4&; & ampemui 1 1 & amp; & miui12.0.7 app version: Keep7.6.0 keep is a fitness tool application with social attributes. Users can use the fragmented time to choose fitness courses suitable for them at any time and anywhere, and carry out real-life synchronous training. Keep is an app, which was launched on February 4, 20 15. Committed to providing one-stop sports solutions such as fitness teaching, running, cycling, making friends, fitness diet guidance and equipment purchase. Keep has opened an offline sports space, Keepland, to sell KeepKit series of intelligent hardware products. The App Store named "20 15 featured applications".