Jarryd Hayne training session!

Check out the first footage of Hayne working out with the 49ers!

San Francisco 49ers quarterback Colin Kaepernick - who also worked out with Hayne at a private facility during pre-season - called the NRL ace a “phenomenal athlete” and said he had all the tools to make it in American football.

Hayne has 125 days to prepare for what would be his first taste of American professional football if he makes San Francisco's 53-man roster when it's announced in August.