Agreed.....just about ok for intervals, at least instills discipline in terms of speed and time, and is obviously much better than nothing. I can happily plod for hours outdoors but if I try it on a treadmill I lose all interest after 30 mins max. I did an hour this morning (in a hotel again) but that consisted of a warm up and then 4 x 1 mile intervals with short recoveries, then a cool-down jog.Treadmill running does have its place in training, particularly in the winter when dark mornings and evenings can limit your opportunities. However, as already mentioned, it can get tedious. The best way to alleviate this in my experience is to do 20-30 minute sessions of intense interval running - eg 2 mins fast, 1 min slow repeated 8-10 times. Again, this would need a treadmill with a bit of oomph to facilitate the fast intervals. Commercials gym treadmills can have speeds of up to 24kph and I don’t think I’d bother with a home one unless it had a top speed approaching 19-20kph.
Although it's physiologically easier, I actually find treadmill running harder. No way, for example, I can match my parkrun pace on a tready.
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