I have actually cut down on the amount of running that I do. I mostly skip rope now. IMHO, this is a very underestimated training tool. People tend to believe slick marketing that says that you need to use this or that piece fancy equipment. Just get a jump rope. If your ceilings are not too low, and you don't live in an apartment above someone else, you can skip rope @ home.
FIRST THINGS FIRST...
learn how to jump rope properly. People tend to "double jump" when skipping rope. This is a no-no because it puts unnecesary stress on your knees. When performed correctly, your calves absorb the shock rather than your knees.
Go to
www.ringside.com. The have nice jump ropes, jump rope instructional videos, and jump rope mats.
A nice High Impact Interval Training (HIIT) approach works out well and doesn't take a heck of a lot of time. For example, skip rope for 30 seconds and then walk it off for 30 seconds. Do this 5 times and you'll see what it does for you...and it only took you 10 minutes.
As you become more advanced, skip rope for 3 minutes and walk it off for 1 minute - the way boxers do. It has been shown that HIIT burns fat much better than aerobic cardio (e.g. a long, slow distance run - jogging for 4 miles).
Train hard, kick a**
Peace & blessings,