Injuries of any kind are bad for the NFL. They weaken rosters and consequently the quality of the product on the field.
The number of injuries to key players this season is alarming. The number of severe injuries is even more alarming. And it makes you wonder why they seem to be happening so much more regularly.
Most NFL players take some downtime following a season to rest, convalesce, travel and spend some time with their families. Then they begin to train, many with certified professionals who can accelerate targeted gains so that these athletes can achieve their innate physical potential.