I have created a few templates to help you to make contact with other webmasters and set up reciprocal links between your sites:

Link Exchange Template 1

Link Exchange Template 2

Link Exchange Template 3

Here are some possible subject titles for your link request emails:

• I saw your site about [rugby in Wales]
• Link exchange request from [Leicester Swimmers]
• Reciprocal link exchange around [Gymnastics]
• I just visited your [UK Dance] website - well done!
• Your links page on [West Midlands Volleyball]
• Please consider [Xoolon] for a link exchange!
• Can we increase our pagerank for [running]? 
• [Torquay Tigers] - increase your link popularity!
• I have linked to your [running] site!
• Your Athlete resources pages
• Hi [David] - I run [Sports Reunited]...
• Link trade proposal for your consideration!
• Can you send me a description of your site for my links page?