More miles... or intervals for Long Distance Ride training? I'm planning on doing the Seattle-to-Portland ride in mid July of this year. I'm not looking to set any speed records, I just want to finish the ride in one day. I've been reading alot about interval training and how it is a great cardiovascular work out. I'm just wondering if this is something I should implement into my training? Or should I just keep pluggin' away at the big miles?