Kendrick Lamar may be small, but the man is mighty -- that much we can tell by the way he trains in the ring.
The Grammy-winning rapper has been getting his box on lately at a gym in Northridge, CA -- about 20 minutes north of L.A. -- and TMZ Sports got a hold of what appears to be the only footage of Kendrick in the ring doing his thing. This clip is from earlier this year.
Dude's from Compton, but it seems he's been looking to keep an even lower profile than usual .