P90X is a home workout program. While working out at home can be convenient, it does have its drawbacks. One of these drawbacks is that you my not have access to all the same equipment that you'll find in a gym. P90X requires minimal equipment but, does call for a chin-up bar. If you don't have a chin-up bar, don't fret; use a resistance band.
Pull It Up
P90X includes both resistance exercises and cardio workouts. The resistance exercises include both weighted exercises and others that rely on body weight alone. Just three of the videos include pullups. These workouts include "Chest & Back," "Legs & Back" and "Back & Biceps." Each of these videos includes a variety of pullups such as close-grip, wide-grip pullups and reverse-grip.
A chin-up bar is a great tool if you have somewhere to keep it. A standalone pullup and dip station is the choice in most gyms, but for the home user they may take up too much space. You can get chin-up bars that attach to your ceiling or wall, but this can be unsightly for a home setting. Beachbody markets a P90X chin-up bar that attaches to a door frame; it won't attach to all door frames, though.
If you don't have a chin-up bar, the "P90X Fitness Guide" recommends using resistance bands with a door attachment. The door attachment is a small loop that you place in the doorway above the top hinge and hold in place by closing the door. You then place a resistance band through the loop, pulling the handles downward to imitate the motion of a pullup. This exercise is an excellent option if you lack the strength to perform a pullup because you can simply use a band with less resistance.
To use the resistance bands properly, crouch down with one knee on the ground. Position yourself far enough away from the door that it creates resistance when you pull on the handles. Lean forward slightly and pull on the handles as though you are performing a pullup. Use the same grips as the pullups used in the video. All of the videos feature a demonstrator using resistance bands instead of a pullup bar -- simply look to this person if you're not clear on the technique.