This may be useful, just pick and choose anything that seems appropriate

In Norway we have a nation-wide Bike to Work Campaign, but it only runs in spring, through May and June, I think. A couple of years ago they started asking hefty entry fees to join ( ) so my workplace just opted out and started our own. We now have our own campaign that runs all through the summer months, and then my baby, our very own Winter Campaign, starts up The summer campaign (about 70 people) has it's own web page, the winter one (about 30 people) is just a spreadsheet. In both you enter your km for the day, then you can click to see the results sorted by no. of times biked OR no. of kms biked. Which means that both people who ride often (but maybe not that far), and people who have a long way (but can't be bothered to ride that often) get to be visible.

When I've tried to motivate people, I think of what motivates me. We have some prizes, but the "winners" are just drawn randomly from the bunch of people who have ridden more than 5 times. The most avid cyclists aren't the ones who need motivating anyway, IMO. What most people appreciate is having someone to compete against, being seen and having someone cheering them on. So I make a point out of noticing who's in the campaign, mentioning the most eager ones lately, or the newcomers, by name in a joint email from time to time, and this year I took a round of teh house and handed out chocolates to everyone who'd logged kms in NOvember and I'll do the same next month. I'm also planning a very basic mechanics class, just so that nobody has to go to their lbs just to check their bikes, change a flat, switch tires, and adjust their brakes.

Ok, that's the bike part. We also have a very enthusiastic physiotherapist who everybody tries to avoid because she's forever after us to switch office chairs, or do stretches or something... But I'd much rather focus on the fun fitness stuff.