2 years ago I was in a race with my brother and my hip painfully cracked. It was sore for about 10 minutes and then went away. Last year I was doing long jump in PE. On my first try I did quite well so I thought I would have another go to try and do better. As I was running down the runway my hip/ upper leg cracked and it was rails painful. This lasted about 10 minuites again but I could still feel it after. Further on in PE had to spring between two posts in softball. Here my legged cracked again. After stretching the pain wasn't as bad. For a few weeks after this it would crack quite easily if I moved to quickly. A year later (last week), I was doing long jump again. As I ran down the track I could feel it again but nothing happened and I avoided having a second go because I knew what would happen. I have looked around the Internet a bit and I think it is my hip joint where the top of the fumer meets the hip. I am a 15 year old male and have nothing wrong with me apart from that. Could someone tell me what it is and what I can do about it. Thanks!