My favorite intervals

Tonight I did my favorite interval workout which consists of 20 seconds at about 80-85% of a sprint followed by 40 seconds of walking.  I used this type of workout a lot last season when I was getting back into shape.  I started at ten reps and worked my way up to twenty.  This may not look like a difficult workout, and it's not meant to be.  But when you can do twenty reps, you're in pretty good shape.  I like this workout because of it's simplicity.  I just start my stopwatch and go.  I hadn't done this workout in awhile so I was curious to see what it would feel like.  I did 25 reps with ease.  I'm glad to know that my general fitness hasn't decreased since the end of the season.

So now I'm starting my endurance training at 20 reps instead of ten.  As much as I love this workout, I think it's time to upgrade to something a bit more challenging to my cardiovascular system.