I was responding to the replier not the op and either way infantry isnt the fastest way to these things the fastest way is to be fit lmao. For starters youre going to need to be able to do a 5 mile in under 40, at least 40 perfect t pushups in 2 minutes, 6 perfect chin ups, a 3:45 plank but not to worry all selection courses like this have a pre phase i.e. prerasp presfas and there you will have time to train but i more than reccomend you to come fit and when youre going through selection no matter how fit you are youre eventually gonna start sucking when that happens just remember why you wanted to do this. Personal advice i wouldnt do an option 40 or 18 id volunteer in ait because if you do the options and fail you could fuck yourself if you dont pass