If you can get a couple of 20L water jerry cans to practice with it would be beneficial as its worth while to get used to the grip and movement of the jerry cans. I got my son two to practice with prior to going on selection which helped. If you cant get hold of any trycarrying your mums shopping
You do 5 x 30m without dropping the jerry cans to complete the course so worth practicing turning after each 30m's and make sure he jerry can handles are dry.
i find thats aload of rubbish......its only 2 lenths and its piss....once i got to winchester phase 1 training in week 1 i think it was i had to do 4 lenths with jerry cans and i always went last and dint have any problems....if they r sweaty give them a wipe with ya shirt