Lamar Odom had hooked up with a personal trainer and was busting his ass in the hopes of making a triumphant return to the NBA ... so says Odom's trainer Fareed Samad.
Samad says he was introduced to Odom through his friend, pro boxer Zab Judah -- and they had been training together in Vegas since June.
"He was down 35 pounds," Samad says ... "We talked to the Knicks about him going back to the NBA."
Samad says Odom was so serious about the comeback, he was doing 2-a-day training sessions and "was doing really good" -- but he hadn't spoken with Lamar in the past 4 days. Now we know why.