The site, which launched last month, is aimed at people who play and watch sport at all levels. Members can build a profile page and share their pictures, videos and blogs with fellow sports players and fans on the site, which can also host leagues.
Founder Chris Ward claimed it could be of interest for up to 20m grass-roots sports people in the UK.
Progress has been briefed to handle search marketing for the site and create an online and PR campaign. Once the number of members has risen, Progress will also help Tired & Tested find brands to sponsor sections of the site.