While prolific musician Maynard James Keenan is balancing three highly popular bands, the frontman is also running his own vineyard and honing his skills in Brazilian Jiu-Jitsu. Now the A Perfect Circle, Tool and Puscifer singer has been spotted training with some UFC greats. Over the years, Keenan has bumped into a series of UFC competitors. From UFC superstar Nate Diaz to bantamweight queen Cat Zingano, the frontman has trained with the best. Check out a gallery of some of the UFC's best that Keenan has taken the time to hone his skills with down below: Keenan hits the gym with former women's UFC bantamweight champion Holly Holm and Carlos Condit. The rockstar trains his skills with Women's UFC bantamweight queen Cat Zingano. Cat Zingano and Maynard James Keenan take a break from training. The Tool frontman found himself a little over his head in this scenario. Taking a break from his vineyard in New Mexico, Keenan makes a trip to Albuquerque to visit Jackson Wink gym. Holly Holm hanging out with Keenan during a Puscifer tour. For more MMA news click here.