I've started running in the last few months (about 3 times a week), at
varying distances between a mile and 6k, having never really ran
before in my life. I'm 24, 135-140 lbs and 5'9, with very little body
fat, but not a great deal in the way of muscle either.
Over the last few weeks I've observed that my best 1500m time so far
is 6:07, and my record in a 30 minute timeframe which I've been
allowing myself on my "distance days" is 6.36k.
My question is, that all these times are being ran on a treadmill in
my gym, as opposed to outside on a track. On the positive side for my
times, this is done without any refreshments throughout the run, and
the treadmill takes a number of seconds (certainly 15-20) to reach the
speed I've set, but how do I really know what I'm running? Are
treadmills entirely accurate?
I don't want to be lagging way at the back if I enter a 5k race,
which, based on my treadmill exploits, I think I could certainly do in
an admittedly modest sub-25 mins.
I only ask this, after dubious experienced with weights machines in
the gym, which can be deceptive as to what I can really lift, which is
shown when I revert to free weights.