TRX for core strength

The TRX makes it easy to build core strength.  The 2-min videos below show a few of the exercises that my personal trainer introduced after about a year.  To start with, I could do about five Atomic Pushups.  Note that at that time I was able to do 10-15 regular pushups.  Worked up to 12 Atomic Pushups during pre-season ski conditioning.