How new Charger Khalil Mack helped Joey Bosa get his groove back

By Eric D. Williams
FOX Sports NFL Writer

COSTA MESA, Calif. — Joey Bosa is on the move, going through his meticulous warmup routine at the start of practice for the Los Angeles Chargers. 

He effortlessly bends over to touch his toes, then takes off on high-knee sprints across the field. Meanwhile, Bosa’s teammates are lined up, going through a traditional stretch period with the team’s training staff.

Bosa beats to his own drum. It’s not…