Gorilla Gym Gym1 Pull Up Bar Core Unit Premier next generation pull up bar. Safer, sturdier, turns your doorway into a full home gym. A compact patent-pending fitness platform with plug & play attachments that allow you to run, box, kick, swing, weight train & even enjoy yoga. Lightweight and portable - ASTM safety certified for up to 300 lbs Installs in your standard 25 Patented vise-grips secure to doorway enable 3x more upper-body exercises than regular pull up bars.