Walking Score
A single number (0–100) that reflects how you're walking right now. Your recent regularity, volume and current streak, not a lifetime record. It updates daily and fades old data progressively: your form, not your career (that's what Footprints and certifications are for).
% of valid days, weighted so recent days count more, a day 30 days ago counts half as much as today, ~2% at 180 days.
Same recent-weighted average, with diminishing returns per day (7 km/day ≈ max) so one huge outing can't dominate. Footprints already reward raw distance.
Your streak in progress only, a past streak, once broken, stops counting here (it's still on your record via certifications and Footprints).
From 30 activities: your last 30 days vs. the 60 days before that.