Explain what bursitis is and what characteristics the mentioned sporting activities have in common?

Explanation:

Bursitis occurs when the bursa inflames. This can happen due to some activities using some joints for a prolonged time and with a lot of force. This bursa is essentially a sac that is filled with synovial fluid and it is located where there is direct contact between bones. This is there to reduce friction between some tendons or muscles and the bones in a joint. Cycling, long-distance running, and tennis are all high impact sports and really overuse some joints like the knees or wrists.

when comparing the cases, what similarities are there in the cases that suggest one person committed these murders?

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