OK so I've just come back from the gym, and I noticed something while on the treadmill.
We bought a treadmill this summer, and I have been using it sporadically. Recently I've been at it more frequently as I decided to reboot my diet/weightloss and I can now run for about 30-40 minutes non-stop (yay!).
However when I used the treadmill at the gym today, I found I couldn't run more than 8-9 minutes without getting puffed out! I had to have slow intervals and also slow down my running speed. I was so disappointed!
Why was there such a big difference? When I ran on the gym treadmill I began with the same speed I do at home. The only thing I can think of is that I run barefoot or with just socks on my treadmill at home, but how can that make such a big difference to my stamina?