Hello all, recent lurker here and I've learned a lot from reading posts way back. I've not seen much about structured training for clydes, and I apologize if I've missed it.

I'm 43, 315 lbs., have been riding seriously now since about April of this year. I began by riding a Trek 7.2FX to work a couple days a week (17 miles each way), I stepped up to road tires and wheels on my Trek, and then I purchased and am now riding an Orbea Onix road bike which I absolutely love. I'm still riding my 34 mile round trip work commute a couple days a week and then usually a good mountain bike ride (15 miles) and a 30-ish mile road ride on the weekends. I also do a group fitness workout 3 days a week for an hour each day, running stairs, lunges, hill running, pushups, dips, etc. I've lost about 60 pounds in the last 9 months or so, and my fitness level has improved a ton.

I am ready to improve my cycling, and I'm wondering if any of you have used a specific training program suited to a Clyde. Right now, I just get out and ride and really enjoy it, bike paths only. How should I go about specifically training to improve my speed, climbing, endurance? Should I just keep riding varied rides, or is a more structured program right for me?

I'm planning to ride the MS150 in June of 2010, and I want to make sure I'm ready for that.

Thanks all for any help.