He athlete main complaint of pain is along the medial boarder of both tibias. he states the pain started about 3 weeks ago after a hard sprint workout in which he ran hills afterward. he states that it used to hurt only after running but now it is hurting all the time. he has the same shoes he wore last season. he has also started working with the triple jumpers. he has less than average flexibility in his gastroc/soleus complex and hamstrings. what injury is this athlete dealing with?