Quote:
Originally Posted by
rjmaiorano 
Good call on the bike rollers. Used to use them occasionally... They require a pretty good amount of concentration the first few weeks. But you get used to it after a while. Good option if you already have a road bike.
its a good excuse to get a nice road bike too.

at least you can break out the rollers if you already have a road bike and you don't want to ride outside if its too cold/hot/dark/late/early.
from there you can set up a heart rate and cadence meter and it will be a low impact calorie burning machine. the always keeping the balance thing is similar to using swiss balls for crunches, benches, ect... you have to constantly use the core muscles to keep balance even when you're rolling good.