I can comment on the pushups......When you do pushups keeping your elbows in, they are easier.......60 in 2 minutes would be easy.
80 Situps in 2 minutes.....definitely can be done, and I am sure that the TRX can improve this workout for anyone that uses it enough.
6 pull ups....EASY!!! I could only do 2-3 and then started doing them regularly and got up to 12-15 in probably 30 seconds....ALL the way up and down.
The 3 mile run would be a challenge becaus you are looking at probably RUNNING a pretty good speed through out the whole 3 miles........start on a treadmill to find the right pace. set it for 21 minutes and maybe 7 mph and then adjust each time you run from there. I suggest you get the 3 miles down to 18 to 18:30 to allow for any changes in conditions that you might encounter in their "tryout" type recruitment. You never know if it will be cold, hot, windy, or raining.....can affect you differentlt when running.
I have yet to use the TRX, but next week I should be rolling into my routines after my surgery on my leg. All my exercises will be with one leg, should be fun. I would say they TRX could definitely help you in ALL of the areas. Check youtube and these forums for exercises that people have come up with....You can do anything with this thing!!
Just my 2 cents.
J. K. Hogge
Proud owner of a TRX FORCE!!