Friends in Littleton Colorado area

Hi, I am 52 years old and a single mom. I am looking for friends I can meet up with at Red Rocks or Club USA or Roxborough / Waterton Canyon for some hiking, exercising and working out together. I still have a ways to go so I am not running any marathons yet or anything. But if you live around here and would like to meet up once in a while to work out I think that would be awesome! I would love to hear from you. Thanks.