The p90x workout. if you know anything about p90x, then you�re probably well aware of the role that bodyweight exercises play in the program. the chest and back workout is no exception. this routine is heavy on pushups and pullups, so prepare yourself! i was struggling during the first workout, but it does get easier if you stick with it!. Benefits of the p90x chest and back workout. the p90x chest and back workout balances each pushing movement with a pulling movement. that helps you avoid the common mistake of overworking muscles you can see in the mirror (the pecs) while underworking those you can�t (the lats).. P90x chest and back workout! bring it! more vids coming soon! subcribe to channel! feel free to comment/like/share..