How do I get into position for the X3 chest press to prevent the bands from slipping?
It may be a bit tight to get the band around your shoulders for the chest press and tricep press, but as with all things, the more you do it the easier it will get.
The first step is connecting the bands to the X3 bar in the “doubled-over” format used for the chest press, deadlift, bent row, etc. Next, grab the band in the middle, so the bar is hanging parallel to the ground. Then, put your head and one shoulder through the opening between the band and the bar.
Now the bar should be at a 45 degree angle in front of you and one of your shoulders is now between the band and the bar. For that shoulder, situate the band so it wraps around your arm between the deltoid and tricep.
When it is securely in place, drop the band down on the other side of your body to get the band position on the other shoulder/tricep to match. You are now ready to do the X3 chest press with the band in the correct position, and by keeping constant tension, the band will not move during this exercise.
Check out the method Dr. Jaquish uses to get the bands around himself for these exercises: