Ahead of his WBA, IBF, WBO and IBO heavyweight title defense against Oleksandr Usyk on Sept. 25 in London, the British boxing champ, Anthony Joshua, is training harder — and smarter — than ever before. AJ regularly employs boxing workout routines that involve movements that can be attempted by people of all fitness levels, and with a few simple modifications, these exercises can be dialed up or down and even attempted at your local gym, or even around the house, garage, or park.Joshua is famous for his full-throttle training style — and his chiseled physique — and is now in the final stages of preparation as he attempts to knock out Usyk, the former cruiserweight king. Typically, a fight camp lasts for 12 weeks and will involve elements of strength, power, and conditioning to hit a fighter’s peak performance. Between boxing drills and sparring, boxers must complete endurance exercises and work the muscles in order to get those explosive bursts.