I wouldn't worry about 'stretching out your stride', focus on turning your legs over quickly.
One thing that inevitably happens when you stride out is you end up landing with your heel out in front of you somewhere which means you are effectively braking with each step. The only time I worry about stretching out the legs is when I'm running intervals which is at about a 2:50 per km pace, anything under 3:30 I just worry about turning the legs over efficiently.
Speaking of efficiently, nothing builds running economy like the long run. I'd vote just going out for a timed run with no set distance, ie: go for an hour long run and don't worry about the distance you cover in that hour. The long run is a staple of any runner and is the one session a week they won't miss. I usually do my long run on time not distance and an hour run is one of my go to sessions. Some weeks I'll cover 18km, last week it was 5.9km courtesy of a bunch of hills over 40% in gradient. I don't know what distance I'm doing when I run so long as it's for my predetermined length of time. That will also save you getting injured as you won't be out chasing down your own times.
[video=youtube;mTMgIViinuQ]http://www.youtube.com/watch?v=mTMgIViinuQ[/video]
Here's a great video on running form. Keep in mind while it looks like he's striding out a bit he's probably running at about a 2:55 pace whereas the punter in the last bit of the clip would probably be in the vicinity of 4-4:30 minutes per km.
Edit: Don't worry too much about intervals, they are for when you plateau or start racing. As an old coach of mine put it, speed work is the icing on the cake and you have no cake! Go run up some big hills instead, does wonders for form and strength as well as being lower impact.
One thing that inevitably happens when you stride out is you end up landing with your heel out in front of you somewhere which means you are effectively braking with each step. The only time I worry about stretching out the legs is when I'm running intervals which is at about a 2:50 per km pace, anything under 3:30 I just worry about turning the legs over efficiently.
Speaking of efficiently, nothing builds running economy like the long run. I'd vote just going out for a timed run with no set distance, ie: go for an hour long run and don't worry about the distance you cover in that hour. The long run is a staple of any runner and is the one session a week they won't miss. I usually do my long run on time not distance and an hour run is one of my go to sessions. Some weeks I'll cover 18km, last week it was 5.9km courtesy of a bunch of hills over 40% in gradient. I don't know what distance I'm doing when I run so long as it's for my predetermined length of time. That will also save you getting injured as you won't be out chasing down your own times.
[video=youtube;mTMgIViinuQ]http://www.youtube.com/watch?v=mTMgIViinuQ[/video]
Here's a great video on running form. Keep in mind while it looks like he's striding out a bit he's probably running at about a 2:55 pace whereas the punter in the last bit of the clip would probably be in the vicinity of 4-4:30 minutes per km.
Edit: Don't worry too much about intervals, they are for when you plateau or start racing. As an old coach of mine put it, speed work is the icing on the cake and you have no cake! Go run up some big hills instead, does wonders for form and strength as well as being lower impact.
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