Lions running back David Montgomery is known for being tough to tackle. His lower-body strength and thick build are a rough assignment for even the best NFL defenders to get onto the ground.

Even though he’s coming off a very good first season in Detroit, Montgomery continues to push himself to be even better. That means attacking the weight training in the offseason.

Montgomery was captured deadlifting 705 pounds in a recent workout that has gone viral on social media. Here’s one of many posts showing off Montgomery’s prodigious strength:

@the33rdteam Is another 1,000 yard season ahead for Monty? #nfl #football #weightlifting ♬ Sunrise – BCD Studio

To put it in perspective, 705 pounds is roughly the weight of an adult manatee or a healthy grizzly bear.

(Photo by MIGUEL MEDINA/AFP via Getty Images)