different exercises to build endurance, aerobic capacity?

rapat

I started treadmill running 3 months ago and I think it's much better than an elliptical, bike, or rollerblades for getting mysef to push hard for 30 minutes. And its easy to measure performance and and to try harder the next time (recording the treadmill speed, increasing it the next time).

But I can really only do it twice a week at peak performance. If I try running 3-4 times a week, then shin / lower-leg soreness carries on from one run to the next.

But I also want to continue to build both my aerobic capacity and also my speed/quickness -- as I play hockey -- I've already noticed an improvement as a side-effect of running and want to keep improving

Question:
If I perform exercises that use different muscles on 6 days a week, would that help building endurance and overall speed while prevent muscle-overtraining?

sunday: run (couch to 5k week 1, running as hard as I can do so and still complete 8 1min runs)
monday: rollerblade (I'm thinking of using the couch to 5k app's week 1 to turn it into outdoor intervals)
tuesday: elliptical or swim (I find swimming a bit boring as I need to either be listening to the radio or watching tv during cardio to keep me entertained)
wed: run (20-30 min constant pace run)
thu: rollerblade or use rowing machine
friday: rest
saturday: hockey game

Does something like this make sense?
Any suggestions for other forms of exercise that build endurance or speed while letting my running-required muscles recuperate?

DavPul

This is all relatively easy cardio so I don't think you'll have to worry much about overtraining. And since they are all endurance exercises, as long as your are trying to extend the duration or intensity of the work you will increase your general aerobic capacity.

Netwalks

Have you tried RPM (spinning class) it might make a nice change for you x