Is this enough to warm up before weightlifting?

Hi, before I do weightlifting I do 20 push ups is this enough or should I do some stretches aswell after? Is this enough to warm up?|||no, not even a 100 would do it. start off with moving in your place, then move faster, do anything that can increase your heart rate. then, focus on stretching each muscle for 1-2 min per muscle group, that should be it!|||I don't think it's enough. I actually injured my shoulder by doing pushups without warming up first. I think most people recommend 10-15 minutes of an aerobic activity such as walking/running or riding a bicycle before weight lifting.