I reduced the run walk ratio and my speed actually increased. I know that, run walk is supposed in any cases to actually speed up times and that this is a well documented. It still feels counter intuitive and today it actually worked. I started off with a 5 minutes warm up and then went into 30 secs run 30 secs walk and it actually worked well. My legs felt less fatigued and i was able to continue at a faster speed in fact i got faster as i went along by a small amount. The was probably the best run i have done. still can't believe that it worked.