Usain Bolt -- I've Got a New Trainer ... That Awesome Jamaican Kid!!!

STRENGTH!!! NO WEAKNESS!!!

Usain Bolt is about to be pushed harder than he's ever been pushed before -- courtesy of that amazing Jamaican strength trainer who lit up the Internet.

Bolt and Demarjay hit the road together in a segment for the 'Ellen' show -- with Bolt explaining, "You'll been seeing this young Jamaican trainer Demarjay."

"Him say 'Me no do weakness' Such a brilliant child.. #BoltvsDemarjay."

Demarjay became a viral video sensation after footage of his intense training sessions hit the web -- this should be amazing.