Intensity while playing football

So recently a coach who coaches an academy came to visit and prepare our team during preseason. For context this coach is from England where he coaches at a major academy, so he knows what he's talking about as he had seen the players at the very top level. So today after training he told me I should be absolutely dominanting not just technically but absolutely physically. He said word for word, " You should be absolutely dominanting not just technically but especially athleticaly ". Now I'm pretty great technically usually one of the best when we play games and I'm also 6'1 at 14 about 170 pounds turning 15 next year. But the coach said if I improve my intensity I will be able to go up to multiple levels. I have been think about this and when I go on the pitch I give it my best. So what does he mean by intensity. Intensity like off the ball? I'm really just confused. So if someone could help me understand what he means, I would really appreciate it.