The company I work for does a little bit; they have annual health fairs and from what I can remember, those are very small (I telecommute and have not actually been in the office for a few years, but I can remember getting a flu shot and an apple and a pack of bandaids for going). They send out "weekly wellness" emails to the employees which focus on ways to be healthy. In the past, they paid a portion of a rec center or gym membership, but budget cuts took that one away. They did give away pedometers at one point and had points you could earn by doing healthy things.
My hubby's work does a lot, however. They have an on-site gym, the company sponsors two teams for the Ragnar Relay race each year (pays all entrance fees, which are like $100 or more each, pays for all food and beverage, gas and van rental, hotel stay). The department my husband is in does a lot of contests, such as one month they all trained for a pushup contest, or they do weight loss contests. Many of them go to the gym together or run in races together. They pay for a crate of fruit to be delivered to the break room each week and the employees all have a "fruit time" break in the morning.
It is awesome to hear of all the other things companies are doing to help employees be healthier. I hope more companies will move in that direction