This dependes on what you want to do.
If you are running a marathon with a goal time in mind, I'd advise to try to get up and down the hills with as little effort as possible; taking the early uphills too hard can drain your reserves too early and going downhill too hard can really trash your quads. Think light and easy; high, light turnover on the downs.
Now, if you are actually racing a specific opponent, sometimes, especially late in the race, you can discourage them by maintaining a steady pace on the uphill and opening some distance just past the crest.
Of course, if you are just doing a training run, it is a good workout to really charge the uphills and "float" the downhills.
Post a reply on the Bulletin Board