Over the next five or so minutes, I am utterly immersed in the session. I had to stop myself instinctively throwing my arms out to catch a ball thrown towards me, or physically ducking down to tuck myself into the back of the scrum. I can hear the players calling to each other, laughing, the songs of the birds in the nearby trees and the meaty crunch as a player pulls me to the ground with ease. It’s an utterly bizarre blend of the surreal and the truly believable; you flinch when you’re tackled and twitch when it’s your turn to drive. You can’t help it, it just feels that real.