denise fedyszyn , 37 , from holmfirth , was told : ` you 're too fat to ride '
mother-of-two , who weighed 20st 4 lb , joined a weight watchers group .
started diet plan and regular runs , and lost more than 10st in 12 months .
dropped eight dress taking her from size 26 to a size 10 .
inspired , her friend lisa walters lots 35 lbs in two months .
the pair had been mortified of pictures of them as bridesmaids .