Dear friends,

Steps challenge 14 will start on Friday April 20th and will run for 31 days. This is how it works:

1. You put down $50
2. You set a daily goal for yourself (e.g. 10000 steps a day or 6000 steps or 19000 steps a day)
3. We discard your three worst days in the challenge
4. Your daily score is calculated as log(#daily_steps / goal)
5. We sum your daily scores to get your total score
6. You win if your total score is not negative
7. All winners will get $40 back
8. The rest of the money ($10 from everyone and $40 from those who lost) will be distributed among the winners proportional to their total number of steps * their goal
9. Don’t have Fitbit? No problem! Please update us daily of your device steps
10. Technical difficulties? Please let one of us know ASAP
11. How well are you doing? Click on your name (and others) and compare: https://synchronization.github.io/challenge/

Please send your $50 to one of the organizers:

• sahar.ayazian AT gmail.com
• fmmirzaei AT gmail.com
• roozbeh.daneshvar AT gmail.com

Thanks for being a part of this challenge!

Best,

Sahar, Faraz, Roozbeh

Appendix: How do we calculate “average log steps”?

average log steps = EXP(SUM(LN(#DAILY_STEPS / goal)) / (NUMBER_OF_DAYS))*goal

In which the SUM is calculated over the n-3 best days and NUMBER_OF_DAYS=n-3

Appendix: How do we calculate the prize?

extra prize = (average steps * goal) / (total of average steps * goal for every participant)

After taking the three vacation days into account

We encourage you to make a copy of the spreadsheet and play with the formula to have a better sense of how it works.