12/09/2013 at 08:00 AM EST
When most The Biggest Loser
contestants are eliminated, they devote themselves solely to their weight loss. But Ruben Studdard
is more focused on something else – his career.
"It was difficult leaving," the American Idol
winner told reporters after being eliminated from the NBC weight-loss show. "But I had a lot of work waiting on me when I left the ranch. As soon as the next day started, my work started."
The "Sorry for 2004" singer is currently working on a new album with producer David Foster and will be heading out on a Christmas tour with CeCe Winans, Peabo Bryson and Melissa Manchester.
"I will be out the whole holiday season so I won't be home, but if I was, we would definitely be having a healthy Christmas this year," Studdard, 35, said.
's Velvet Teddy Bear had already been sent home from the show two weeks prior to his recent elimination but returned
"I don't think there was at all any conspiracy to bring me back," said the self-described "sexy
" singer. "My only concern was my health."
Studdard – who arrived at the ranch
weighing 462 lbs. – is now down to 349 lbs. and hopes to continue his weight-loss journey through to the finale.
"I celebrate every pound I lose," said Studdard, who recently completed a 5K run. "I thought after a mile or two I would be winded but I was fine. I'm in much better physical condition."
And if Studdard happens to win the at-home weight-loss prize, he already has an idea of what to do with the $100,000.
"I'll probably donate most [of it] to my foundation
," he said.