Eccentric exercises (EE) have proved successful in the management of chronic tendinopathy, particularly of the Achilles and patella tendons where they have been shown to be effective in controlled trials. However numerous questions regarding EE remain. The standard protocols are time consuming and require very motivated patients. EE are effective in some tendinopathies but not others. Furthermore the location of the lesion can have a profound effect on efficacy; for example standard EE in insertional lesions of the Achilles are ineffective. Until recently little was known of the effect of EE on tendinopathic tendons, although a greater understanding of this process is emerging. Additionally recent in vivo evidence directly comparing eccentric and concentric exercises provides a possible explanation for the therapeutic benefit of EE. The challenge now is make EE more effective. Suggestions on areas of future research are made.