J.J. Watt: White Men CAN Dunk ... After Hernia Surgery

What hernia surgery?!!?

Here's J.J. Watt DUNKING A BASKETBALL ... just 4 days into his "full training" after undergoing groin surgery back in January.

The Houston Texans star was cleared to go back to full strength training earlier this week -- and judging by the video ... it's going well.