Rest and ice are considered first-line therapy for acute Achilles tendonopathy (strength of recommendation [SOR]: C, expert opinion), as is nonsteroidal anti- inflammatory drugs (NSAIDs) (SOR: B, systematic review). Chronic noninsertional Achilles tendonopathy should be treated with eccentric calf-muscle training (ECMT) (SOR: B, 3 randomized controlled trials [RCTs])