Johnny Manziel posts video showing off slam-dunking skills

Just three days before he will perform for NFL coaches and scouts at his pro-day workout, Johnny Manziel posted an Instagram video of himself dunking basketballs. The former Texas A&M star quarterback hopes to be drafted No. 1 overall to the Houston Texans in about six weeks, but he has been briefly distracted by the roundball.

To the video:

So what can we learn from this clip?

For one thing, we can certainly glean from the gym surroundings that Manziel is back on the Texas A&M campus already, no doubt throwing to his former Aggies receivers when he's not on the hardwood, getting ready for pro day. In getting back to campus and immersing himself in his pro-day environment, Manziel might have taken a good cue from UCF's Blake Bortles, who did the same in the days before his pro-day workout, while Louisville QB Teddy Bridgewater's well-documented glove issues suggested little transition time from his training facility in Florida.

As for Manziel's dunking prowess itself, it's surely a lot more impressive than his blown lay-up at an Atlanta Hawks game before the Chick-fil-A Bowl in December. But one can only wonder if those rims are truly set at 10 feet. Let's go to the math (disclaimer - just having some fun here):

Manziel is 6-feet tall (he officially came in at 5-11 3/4 at the NFL Scouting Combine).

Add his combine vertical leap of 31.5 inches, and you're at 8 feet and 7.25 inches.

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His arm length at the combine measured 31 3/8 inches. Here's where things get tricky: Add that to his height plus vertical, and Manziel figures to have roughly 11 feet, 5 inches worth of get-up on the basketball court. But since vertical arm length extends from the shoulder and not the top of the head, scale it back some. Give him 10 feet and a lot of change. Certainly enough to dunk, but the trick-shot dunking seen in the video is a far tougher challenge.

You make the call.

Follow Chase Goodbread on Twitter @ChaseGoodbread.