Seahawks were the NFL's third-healthiest team in 2015

Given the violent nature of the NFL, every team at one time or another can point to injuries as a reason for failure.

But Football Outsiders does a great job of providing context for those injuries with its Adjusted Games Lost (AGL) metric. The idea is based on two principles:

"(1) Injuries to starters, replacement starters, and important situational reserves (No. 3 wide receiver, nickelback, etc.) matter more than injuries to bench warmers; and (2) Injured players who do take the field are usually playing with reduced ability, which is why AGL is based not strictly on whether the player is active for the game or not, but instead is based on the player's listed status that week (IR/PUP, out, doubtful, questionable or probable)."

In 2015, the Seattle Seahawks finished with an AGL of 40.1, which ranked third in the NFL. Only the Cincinnati Bengals and Atlanta Falcons had better injury luck last season.

The Seahawks suffered injuries to prominent players like running back Marshawn Lynch (nine games missed) and Jimmy Graham (five games missed), but overall, they were a healthy bunch. Quarterback Russell Wilson, cornerback Richard Sherman and safety Earl Thomas started all 16 regular-season games.

One factor the metric doesn't take into account is when the injuries occurred. The Seahawks went into the playoffs without running back Thomas Rawls and Graham.

If you're wondering about possible trends, the Seahawks finished 18th in AGL in 2014 and 12th in 2013.

The site also looked at injury report data and specifically the "questionable" designation. Last season, the Seahawks had a player listed as questionable 32 times, and on 16 occasions, the player was active. The 50 percent play rate ranked below the league average of 62.4 percent.