I have a regular place for my bi-daily runs and I do a warm-up walk from the car park to a certain point. I know from years of dog walking that it is about 5 minutes... or so I thought! I timed it a couple of days ago, and it takes a mere 2 minutes - opps! It normally takes 5 due to the hound sniffing, paddling in the river and whatever else she finds to do.
A couple of runs ago I timed a good brisk walk before I started running. The run was easier - much, much easier. The initial 5 minutes does make a difference.
Peeps, don't skip this warm-up. Running on warm legs is so much nicer.