Teammate keeps going too fast on easy days.

well if he doesnt listen to the coach and he doesnt listen to the captain, he will have to learn the hard way by not improving as much or getting injured

People don't listen, they have to learn from experience.

The most helpful thing you can do is to fast track his road to burnout - encourage him to go faster on easy runs!

I've been on a couple teams with a guy like this. If there are two of them it isn't as much of a problem because they can go off on their own. But just one is tough because it tends to make the whole group go too fast. The best thing is to keep running the right pace, if you can, and let that person go off ahead on their own if they insist.

But is there a way to solve the problem? Well first, it might not really be a problem. Some people really just feel better running at a faster pace on easy days. I had a teammate like this. Maybe it depends on your muscle fiber types or something like that, I'm not sure.

Another possibility is that this guy might have a chip on his shoulder, or be looking for a pissing contest. If you think that is going on, and just letting him run ahead isn't working, and you are looking for a drastic measure... here is an idea. Wait for a day when he is being especially aggressive with the pace, and you don't have an important workout or race coming up, and call his bluff. Match the faster pace he is pushing, then push it yourself until he is struggling to hang on. Use your legs to punish him until he is gasping for breath. Ideally you should be really relaxed the whole time. At the end of the run, as he grabs his knees, calmly say something like "easy runs are supposed to be easy, we don't have anything to prove on a day like today. Prove it in the workouts and races!" (This only works if you are a far stronger runner than him, of course. If not, this should only be tried by someone who is, because otherwise it can just devolve to racing on an easy day which just reinforces the bad behavior.)

Let him go ahead and turn down a different street early in and ditch him. If he doesn't get it after doing this a couple of times, then just keep doing it. That way you and your group can run easy and not have him in front of you trying to bait yoy.

Is he the top guy on the team and completely dust you in races? If he is, his easy probably isn't the same as your easy.

So why does that bother you? You can control what you do and how you respond to what other people do but you cannot control what other people do ... didn't come up with this myself. I heard it a long ago.

If he goes out on his own, let him be on his own.

I knew a kid who would run hardest to get a soccer ball that would go out of bounds. When in play, he would lays asx and scream at everyone. I am sure he had his reasons. He thought he was good and he thought he hustled. I thought he sucked so I ignored the fool.

Advice: quote Mr T in your head. That will fix your response.