Ok, that is the wrong answer. You should bust your hump now to get ready, get in shape on your own BEFORE you leave. If you put forward any effort, you should have no problem meeting those standards. Don't ever set yourself up for failure, don't consider it as being a possibility, and you will do fine.
Although I have not been to Basic Training (I went to a shortened 4 week ROTC "Fantasy Camp" version as my Colonel calls it :lol: ), my training sergeant has myself and another cadet work out with new enlisted recruits from the Recruiting Office downtown to get them prepared for Basic (physically and by teaching them a few tricks like making beds and shining boots and basic D&C). We have NEVER had one that could not make the standard after leaving us, we even had one female who could not do a single push-up to standard, but was doing 20 after two weeks. This success has very little to do with my buddy and myself, and almost everything to do with the increase in confidence that these now Privates had. If you think that you won't be able to do it, you most likely won't, just remember that this isn't High School gym class where if you make faces and act like your dying, you can get by without putting forth your full effort, that just ain't gonna work in the Army (and probably not in any of the other services either).
Now, if you want to get in shape before you leave, all you have to do is do push-ups, sit-ups, and run on your own, no need for any fancy workout systems or anything, to improve in these events, it is very true that practice makes perfect. Workout with a friend who can tell you if you're making the standard with your push-ups and sit-ups This means break the plane of the shoulders, keep your back straight, and never rest your stomach on the ground or let your knees touch, those will "terminate your performance" on the former. For the latter, you cannot let your butt leave the ground (no bouncing), your fingers must be interlocked behind your head at all times, and to count your back must make a 90 degree angle with the ground each time, and you cannot rest except in the up position. For push-ups, you may rest by sagging your stomach or arching your back, but you need to straighten it again before starting to push again.
I hope this helps you, and good luck at Basic.