Pain, inflammation, or irritation of a tendon, no matter where it is located, is the most basic definition of tendonitis (tendinitis). This can affect any tendon in the body, like those in your shoulders, wrist, and heels.

A tendon is connective tissue, or collagen bundles, that connect a muscle to a structure (typically a bone) and allows that structure to move through a joint.

The tendon, or the fibrous cords that connect your bones and muscles, can be damaged through injury, especially of repetitive nature.

Your age also plays a large role, as your tendons become less.

• Take a Break: Avoid activities that place too much stress on your tendons, especially for long periods. If you have pain during an exercise, stop and rest.
  
  Change Your Routine: If one exercise or activity is causing you pain, try something else. Cross-training can help you mix high-impact exercise with lower impact exercise, such as biking or swimming.
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  Improve Your Technique: You could be setting yourself up for problems with your tendons, if you are doing an exercise improperly. Consider taking lessons or getting professional instructions when starting a new sport or using exercise equipment.
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  Stretch: Stretchmng muscles before an activity or sport can help them bear the load better. After exercise, move your joints through full range of motion. The best time to stretch is after exercise, when your muscles are warmed up.
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  Move right in the Workplace: Make sure your chair, keyboard and desktop are positioned correctly for your height, arm length and the tasks you do. This will help protect your joints and tendons from stress.