The newest Bronco had little choice but to don jersey No. 63 for his first organized team activity of the 2007 offseason. All the numbers in the 90s — including jersey No. 95, which he wore in Cincinnati last season — were claimed by his new teammates.

“Sixty-three is a great number,” he said. “My father was 61. There’s no significance.”

But, to say the least, the jersey was a tad snug on the 345-pound defensive tackle.

“As you can see, I had to hold my breath the entire practice, so I won’t be in this (practice jersey),” he said.

But it wasn’t how he looked in a jersey, but how he looked in action, that concerned Head Coach Mike Shanahan.

“He looked pretty good today, even though he didn’t get a lot of reps,” Shanahan said. “He got a few reps, and it looks like he’s been working out. With the offseason conditioning program and summer camp, hopefully there’s no setbacks and he’s ready to go.

Tuesday’s session was Adams’ first since undergoing arthroscopic knee surgery earlier this year, but he appeared to show no ill effects.

“I feel good,” Adams said. “This is a great system to be a part of as a defensive lineman. It’s an attacking front. It allows us to put pressure on the football, whether it be run or pass.”

More Day 12 notes:

… One of the niftier catches of the day belonged to tight end Nate Jackson, who reached back while falling — and actually had one knee on the ground — in order to snag a pass from Darrell Hackney that had passed just behind him …

… Shanahan said that he thought about returning safety Sam Brandon to full team work this week, but opted to wait as the sixth-year veteran returns from two torn knee ligaments. Shanahan said that Brandon should be “full speed” by minicamp, which begins July 9 …

… More photos from the morning:

More on Adams on the main site later tonight, and more in the blog on OTA Day 13 tomorrow. Adios.