Trainer Steve Zim, right, and assistant Bryan Arceo spot Tri Lai as he works on his abdominal strength at A Tighter U gym. (Anne Cusack / Los Angeles Times)
Trainer Steve Zim, right, shows Tri Lai a post-exercise stretch. (Anne Cusack / Los Angeles Times)
Trainer Steve Zim has volunteered his time to help with Tri Lai’s recovery. He’s been working with the police officer since February. (Anne Cusack / Los Angeles Times)
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Tri Lai works with weights with trainer Steve Zim, left, and Bryan Arceo. (Anne Cusack / Los Angeles Times)
Trainer Steve Zim times Tri Lai as he jumps rope to build stamina. (Anne Cusack / Los Angeles Times)
Trainer Steve Zim says a particular focus is on Tri Lai’s back muscles. (Anne Cusack / Los Angeles Times)
Steve Zim, left, and assistant Bryan Arceo encourage Tri Lai as he climbs a Jacob’s ladder. To return to active duty, Lai will need to complete an obstacle course. (Anne Cusack / Los Angeles Times)
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Steve Zim congratulates Lai after the workout. (Anne Cusack / Los Angeles Times)