Surely Karl with aspiration to compete as a runner (particularly ultra’s) you don’t just want to get bigger?
Any weight you carry that doesn’t help you in terms of speed or form, will slow you down – VO2 is measured in litres per kilogram per minute – KG go up relative speed at the same effort decreases…
I would assume that you actually want to be more “athletic” and this is a very worthwhile objective as an endurance athlete. Too many runners a good at running in a straight line, but inevitably over time due to lack of athleticism and strength, break down and get injured. There is nothing better than getting stronger and athletic AND remaining an endurance animal….
Now the bad news – to do this is very difficult because to become an athlete and retain our endurance and specific fitness, we need to be competitive we need to almost double the training. At the moment you are doing 50-80 miles a week, which is a good mileage for a distance runner, particularly the upper end (say 8-10 hours a week). So to get strong and athletic requires another 3-4 hours at least particularly if you are going to include swimming – which as mentioned above is one of the best sports to build an athletic body (just go to any swimming club and check out the superb physiques of the top swimmers). With swimming and all the other stuff I probably do more than double the number of hours than my running/cycling base.
In my opinion the things that have worked for me are swimming, Concept 2 rowing (brilliant all round for both interval and longer endurance stuff), circuits (I do two sessions a week), upper body weights, lower body weights, plyometrics, balance work, skipping including core. I know this sounds like a lot but believe me if you are serious about being a decent runner and an athlete with a great body which is well defined, ripped and one you would be proud to display on the beach in your speedo’s this is necessary.
However, if you just want bulging muscles like the gym monkeys but no ability to run a decent race then hit the weight room and drink lots of protein shakes.
PS Protein shakes are actually quite useful and helps us to shed fat and get ripped. BTW 3-3,500 cals is not really enough for 80 miles a week. In general, I believe in cutting carbs and increasing fat and protein… Supplement with super foods such as milk and eggs.
Cheers Nick