Popular Chinese fitness app Keep filed for an IPO in Hong Kong on Feb. 25, making it potentially the first Chinese online fitness company to go public. Launched in 2015, Keep said in its IPO filing it has 40 million monthly active users as of last year. The company offers an app where users can watch fitness videos, buy exercise equipment, and build an at-home exercise routine. Keep had previously raised RMB 634 million ($4 billion) within eight years, while it recorded a gross profit of RMB 499,427 in 2020, according to the filing. [36Kr, in Chinese]