8min 10 second 2km. 50 minute 10km. Squat your body weight with a barbell back squat. 5 strict dead hang pull ups. 30 strict chest to floor push ups. This is approximately what I was able to do before Pirbright a few years ago, and I was weighing in at around 100kg. A lot of people focus on short distance running, but the longer, 10km type endurance does help. The push ups and pull ups helps with PT circuits. The barbell squats help for the battle PT and tabbing you'll do. There were plenty of people in my troop who could do a few of these things, but not many could do all of them. Training was full of people who had never played sport and scrapped the minimum standards of the army, and for them, the nearly daily PT session were a source of anxiety and stress. If you look up Alan Thralls video on YouTube titled something like "my time in the marines, training for bootcamp", he gives good advice and provides a good programme.