This study is looking at how pain changes after using manual therapy on people with Achilles tendon pain. The Achilles tendon is a band of tissue at the back of your heel. Participants will feel heat or cold on their skin, and will tell the researcher when it feels slightly uncomfortable. This will happen three times. After this, a gentle therapeutic ankle movement will be done to help with the pain. This is a common and safe technique used by doctors and therapists. The study lasts for only one session, and participants may feel brief discomfort but no harm.

• The study involves one session with three tests of heat and cold sensations.
• Some participants will get a safe ankle movement therapy to check its effect on pain.
• Participants must have had Achilles tendon pain for at least 3 months.

Participants cannot join the study if they have had surgery on their lower leg, certain injections, or are pregnant. Anyone under 18 cannot join. This research could help doctors treat Achilles tendon pain better in the future.