Freeney, 37, visited the Seahawks on Tuesday. He last played for the Atlanta Falcons in 2016, recording 10 tackles and three sacks.
"I only have a certain amount of miles on my body and I don't know when a tire is going to blow," Freeney said on SiriusXM Radio this summer (h/t Sporting News' Alex Marvez). "If I play this year, 16 years is a lot of wear and tear on the ankles, knees and joints.
"I feel great right now but you never know what's going to happen. My training now is more about being smart instead of just trying to lift the building or run six miles."
The Seahawks had an open roster spot after placing Cliff Avril on injured reserve. Seattle is currently tied for 27th in the NFL with 12 sacks and could have used an infusion of pass-rushing ability even before Avril's injury.
Freeney was almost entirely used in pass-rushing situations with the Falcons last season and will likely do the same in Seattle. It's unclear if he has much left in the tank at this point, but the Seahawks liked enough to at least bring him in temporarily.
Freeney is a seven-time Pro Bowler who has recorded 122.5 sacks in his career.