And the big South African has identified the breakdown as an area where he can make a big impact for the Warriors.
Josh told BBC Scotland: "For us, quick ball is key to get the backs going and Glasgow have some nippy and exciting players.
"In South Africa you put big emphasis on getting to the breakdown and keeping the opposition away. If we can be quick and tough there, we'll make it a lot easier for ourselves."
Josh joined the Warriors on a three-year deal earlier this month, and has only been training with his new team-mates since Sunday but he doesn't anticipate any problems fitting into Gregor Townsend's team.
"The game is becoming more similar all over the world, with increased professionalism and coaches moving all around the world," he explained.
"Back when I was playing in France the rugby felt a little bit slower. In South Africa it's a very quick game, you just spread it wide the whole time.
"Here it's a little bit slower and that's when the physical side comes into it and you have to man up.
"From what I saw against Connacht last Friday, the officials are maybe a little more lenient at the breakdown. They give you more time to compete for the ball.
"In South Africa, you have a second and if you are not away it's blown up."
Josh says he's been doing his homework to get up to speed on his new team-mates.
"It's tough having to learn a whole new playbook and new calls in the first week," said Josh, who captained the Golden Lions to Currie Cup success last term.
"I've been doing my homework but I think we are keeping it fairly simple for Friday.
"Training has been good and I'll soon get used to the guys out on the pitch."