Design Fitness Icon for APPs

I need an Icon that illustrates my Fitness APPlications.
I'll have more than 20 applications on topics such as Yoga fitness, running, breathing, Pilates, walking, stretching, golf, injury, marathon, etc.
I am looking for a Icon design that allows to changing colors using make differentiation of the APPs.
a)The icon basis can be through the use of the word or Apps4fit APPS4FIT. using the APP style found in Appstore as "sivanda yoga" "UFIT" "Army eGrade" "Smile Mission"
b) Or it could be with a sporty image style using the APP found in Appstore as (something like "Joggy coach", "MapMyRun +", "Virtual Trainer", "LiveRite" apps Daniel Miller "daily training", etc).
My applications are not aimed at young and healthy athletes. A person of 50-65 years should be attracted to the icon.
The icon also will I receive it, with 15 differentiated icons by their colors
I need to complete the project quickly.