Ever wonder where Clint Eastwood gets the energy to be such a prolific film director at 84-years-old? A lot of the credit has to go to the obvious fact that Eastwood keeps himself in tip-top shape. Now, Harry Styles of One Direction, is taking the actor/director’s advice and is practicing Krav Maga, which is a form of self-defense that was developed for the Israeli military.

It was reported by The Daily Star that Eastwood told Styles that he would need to improve his physical fitness to make it as an actor in Hollywood. Eastwood then introduced the 20-year-old singer to Krav Maga, a reportedly exhausting exercise that combines boxing, wrestling, Savate, Wing Chun, Judo, Jujutsu, and Muay Thai.

A source told The Daily Star, “Clint spoke to Harry about his future in Tinseltown. They discussed movie projects and then got on to the subject of achieving an action hero’s physique.” The source added, “Clint had plenty to say on what Harry should do if he ever wanted to be considered leading man material.”

Of course Harry Styles and Clint Eastwood exchange exercise tips.Why would we think otherwise? http://t.co/JIGL70wIOD pic.twitter.com/xGazis6OYc

— Yahoo Celebrity UK (@YahooCelebUK) August 27, 2014

One Direction bandmates Louis Tomlinson and Liam Payne are also reportedly on board with Krav Maga and are raving about the results.

Styles was recently offered a part in the Harvey Weinstein project Tulip Fever, which stars Judi Dench, Zach Galifianakis, and Christoph Waltz. However, Styles had to turn down the role due to his touring schedule with One Direction. The part wound up going to Matthew Morrison (Glee).

Despite being in his mid-80s, Eastwood continues to direct feature films at an abundant rate. In the past ten years alone, he has helmed ten films: American Sniper, Jersey Boys, J. Edgar, Hereafter, Invictus, Gran Torino, Changeling, Letters from Iwo Jima, Flags of Our Fathers, and Million Dollar Baby. He won the Academy Award for Best Director for Million Dollar Baby.

Eastwood is currently receiving Oscar buzz for his latest directorial effort American Sniper, a war drama starring Bradley Cooper as Chris Kyle, a former Navy Seal who served in four combat tours in Operation Iraqi Freedom. Kyle was considered the best sniper in American history and wrote a book called American Sniper: The Autobiography of the Most Lethal Sniper in U.S. Military History, which serves as the source material for Eastwood’s film. Kyle was killed by a fellow veteran on a shooting range in 2013.

American Sniper will be in limited release in theaters on Christmas day 2014.