FXLV - F45 Training: The Mark Wahlberg Backed Gym Is Growing Rapidly March, 17 2022 01:26 AM F45 Training Holdings Inc. F45 Training went public last year & is growing worldwide. The gym sold 290 new franchises last quarter alone. While the growth is explosive, caveats remain. For further details see: F45 Training: The Mark Wahlberg Backed Gym Is Growing Rapidly