Looking for friends in their 20s needing to lose 10-15lbs

Hey!

Im 29 and aim to loose about 15lbs, or 20 maximum by August :-).
I am not overweight and my BMI is just about boderline normal, but would like to loose the weight Ive gained over the past year and fit into a size 8/10 and also improve my fitness before I reach the dreaded 30!
I think because I dont have to loose that much and know I look ok as I am , it will be hard enough to be motivated at times but will keep thinking of lovely tight fitting summer clothes for my holiday in September!