Months later, in a burst of extra motivation, Rones completed a 2.4 mile ocean swimming competition and 150-mile bike ride.

CNN: Virtual meetups spark real fitness

As Lang got healthier, Tammy Rones signed onto the women's chat group as "Marathon Mom, " even though the 49-year-old's problems with weight and a clubbed foot sidelined her from most sports over the past few years.

CNN: Virtual meetups spark real fitness

"I've always had a competitive side, but Spark has given me the chance to appreciate my successes as opposed to comparing myself to everyone else, " Rones said after running the half portion of the Surf City marathon.

CNN: Virtual meetups spark real fitness