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The purpose of this study was to determine individual muscle forces of the Triceps Surae during a range of rehabilitation exercises for Achilles tendinopathy. We used experimental data (N=4) and musculoskeletal modelling to estimate muscle force (dynamic optimization). We observed clear peak muscle force differences between exercises. In addition, the force-sharing strategies used by the participants (i.e., individual muscle contribution to the total force produced within the Triceps Surae) were different between exercises. These preliminary results could be helpful to objectively determine the progression in exercise loading throughout rehabilitation programs. Additionally, new information regarding the influence of the type of exercise on load distribution within the Triceps Surae may better orientate practitioners in the choice of exercise.