That sounds like a regain you are talking about. No, you don't need to be able to do it first off, you will be taught, and taught again, and you will practice, again and again and again over your Phase 1 training, and beyond.
They will look however for some upper body strength, and more importantly 'guts and determination' on your PRMC.
You will be shown how to do everything at CTC, the PTI's will take great delight in showing you the full extent of RM training. Tarzan Assault is demo'd to you in slow time and then you can have your own shot at it....they even let you do it with no webbing or weapon ONCE!
The RAF PTIs will point at an assult course, and explain that its not the done thing in the RAF, unless you join the RAF Regt where you have to be SAS trained before they will look at you............so Rock Apes used to tell me ukel:
keep practising. pressups are about core strength (see what i did there, aren't i clever?) as well as arms sholders and chest strength. do quality reps before qauntity, and slowly build up. i weighed about 8 stone piss wet through when i started training and put on about 2 stone in training (NONE of it fat btw)
...Speaking of upper body strength.....press-ups.They don't get any better.Any tips for making it from on my knees to full body sorts please ?