My running group is looking to create a challenge for 2025. Our city is turning 250 years old, so the challenge would be to have participants walk, run, bike, hike, etc. 250 miles during the year. We would then enter the individuals who completed into a drawing for prizes.

I think we can use Strava Challenges to do this, but I’m not entirely sure on the mechanics or if Strava Challenges would be able to handle this. Some questions:

• Is there a way to generate a link for a challenge? Or, can people only join by being invited?
• Is there a limit to the total number of people who can participate in a challenge? I know I personally can invite up to 199 people. But are there other limits we should be aware of?
• Do challenges track individual efforts or only group efforts? The goal is for each individual person to complete 250 miles, not the whole group to complete 250 miles.
• Are free subscribers able to join the challenge? Or, are only paid subscribers able to use challenges? 
• As the organizer of the challenge, will I be able to export a list of people who completed the challenge so I can enter them into the raffle?

Thank you for the help!