Audience

G - Gender                                      
E - Ethnicity
A - Age
R - Region
S - Socio-economic  

G - Both - Use of Models, Colour scheme.
E - All - Use of Models
A - 16-25 - Models, Up to date modern style
R - England - Words/ Slogan, Location
S - C1-D - Location/no posh areas

My audience would probably be edged towards the Mainstream category. This is become mainstreamers tend to conform to the norms in society. This means they will be placed in Gyms and such places that have become popular and trendy to get fit. This will allow them to use the product. This category is also the most popular meaning the product will reach more people.