I am using RunKeeper app to track my running and walking.. this app allows me to download the gpx file which will contain all the details about my activity.. like avg speed, duration, elevation etc..
I will just upload the file in skimble..

Can I ask, how do you upload into Skimble? Can't find it anywhere!

we can upload the gpx file through www.skimble.com site. select Sports -> track a sport -> track an activity -> Choose Run -> upload -> upload gps file.

Hope this helps.. if you couldnt find it still, i can send a mail with screenshots.

I searched for this option in both "Workout Trainer" and "GPS Sports Tracker" apps by skimble.. but we do not have this option in mobile apps. I think for now, we need to use desktop\laptop to upload the gpx file.

I agree, I think it's PC only for now. Ideally there will be an integration in the future so thatg when you complete a run in your running app it will automatically update to Skimble (like it does for MyFitnessPal and apps like that). One for the development backlog skimble, and kind of a no brainer :-)

It took me a while to realize that many "pc only" functions can be accessed via skimble.com on any Internet browser on my phone, just not the app.