Too much training, too much stress can lead to over-use injuries. Like Osgood-Schlatter aka Osh Kosh Bgosh: [quote]A relatively common overuse injury caused by chronic, repetitive stress to the attachment of the patellar tendon (the tendon between the knee bone and shin bone) on the bony outgrowth at the top of the shin bone. The injury commonly occurs in children who take part in sports such[ Read More... ]