Tonight at 10:00 p.m. ET on HBO the fourth episode of Hard Knocks, an annual five-episode documentary of an NFL training camp will air. This year's season will follow the Houston Texans, and can be live streamed free by clicking this link. Here are three fun things to watch for during this episode as the Texans' training camp continues.

What Ridiculous Physical Achievement Will J.J. Watt Achieve Nonchalantly?

In the first episode we got to watch J.J. Watt working on his game and physique well into the night. One of the more impressive displays was Watt flipping over gigantic tires like they were nothing. When you see him on Sundays bull rushing mammoth offensive tackles and driving them into the quarterback, you’ll know why. He also flaunted his rap skills when he sang along with Fort Minor’s "Remember the Name." We all could’ve done without that.

Last week, he upped the ante by standing about two feet away from a Juggs machine, which is designed to fire the ball at high speed toward receivers standing at, you know, a receiving distance. Watt was right up near it, and catching every single ball, barely flinching. In fact, he was talking to people while he did it! It was insane, and whatever he does next will surely blow our minds.

Sean Hayes’ Next Wrestling Impression

Hayes, the Texans assistant strength coach, struck again in Episode 3. He burst onto our televisions and mobile devices with an uncanny Macho Man Randy Savage impression, then stole the show again with a perfect Ric Flair imitation. Which wrestler will be next?

At SWN, we’re on our knees praying for him to re-create The Ultimate Warrior.

Charles James’ Socks—And His Jukes

Charles James has been the breakout star of this year’s Hard Knocks—besides Hayes. This cornerback was impressing coach Bill O’Brien so much that he just plucked him from the defense for a bit and tried him out at running back. Honestly, he’s making the rest of the non-Arian Foster RBs look bad.

James, who initially looked like a bit of a clown for focusing so much on his admittedly dope socks, has turned heads as a running back. Don’t run and draft him in your fantasy leagues yet, but watch this man!