If it ain’t broke, don’t fix it. Push ups, chin ups, sit ups, dips, and squats have been around forever and are the cornerstone of any good exercise program. Why? Because they work. They worked hundreds of years ago, they work now, and they will work in the future. You think gladiators did reverse dumbbell preacher curls and then jumped onto their $1500 exercise machines to do a quick set of reverse pectoral flies?