DB and SEF are spot on.
As well as running 4 days a week now (including 1 long slow run) I also play football one night after work. on a largish pitch, meaning lots of short sprints chasing etc.
This gives me 2 rest days (Mon & Fri).
I really found the football tough to start with (breathless very quickly), harder than I thought it would be as I could run steadily for 5k no problem at the time.
However after about 6 weeks this improved dramatically, and now I can really chase around the pitch (for an old-un), and it has really improved my running overall.
I class it as my sprint/speed night (lots of Fartleks).
The Guys are spot on, mix it up then I think.....but after you get checked out.
Edited: 09/10/2011 at 04:25