Adams, who turned 25 last week, became New Zealand's highest-paid sportsperson when he signed a $140 million four-year contract with the Oklahoma City Thunder in 2016.
Centre manager Justine Brennan said Adams worked out at the centre whenever he was home in New Zealand, usually 2-3 times a year.
Brennan said he spent part of his workout yesterday throwing a basketball against a wall that backed on to her office.
"I thought the wall was going to come down. He is incredibly powerful."
Brennan said the wall, often used by rugby players practising passing, was reinforced just last week.
"That was good timing."
Brennan said Adams enjoyed working out at the centre alongside other international calibre athletes.
"It's not a public gym so he's not mobbed by people."
Adams also posed for snaps with Adams Academy athletes who happened to be at the gym, including local sprinters Ethan Holman and Brooke Somerfield.
Membership to the Adams Centre - named for Tauranga developer Paul Adams - is limited to athletes aged 15+ representing their sport at regional level or higher and development squads.
Adams' autobiography: Steve Adams: My Life, My Fight, co-written by Kiwi journalist Madeleine Chapman, comes out on Monday.
