The business partner of a fitness instructor who used her Zumba studio as a front for prostitution in Maine says he doesn’t remember many details. Mark Strong, an insurance business owner, testified briefly on Monday during the first trial of one of Alexis Wright’s accused clients. Donald Hill, a former Kennebunk High School hockey coach, faces one count of engaging a prostitute. So far, 68 people have been charged with paying for sex with Wright, who’s serving a 10-month sentence. At least 58 have pleaded guilty or no contest. The 53-year-old Hill has said he thought he was in a relationship. Wright pointed him out in court Monday but didn’t have to testify. Strong, for his part, said he couldn’t recall details including photos and names found on his computer.