I've been doing another type of interval session on the treadmill in the last month - been doing this every Monday morning for the past 4 weeks.
The 1st time I did it it was hard... really really hard. Sweating buckets by the end, so much so I had to remove my t-shirt... the heat and sweat was irritating me so much. Good job there was no-one else around!
2nd time around it was the same thing. But last Monday and this morning it felt *much* more comfortable - I wasn't desperate for it to finish and I had more energy in the hours afterwards.
I've been curious to see the heart-rate data and lo and behold, it bears out my experience. The green and blue data show a quicker and deeper recovery and lower maximum rate.
So it's only taken my body 3 sessions to adjust and improve - I'm delighted with that.
Message is this: interval training (whether outdoors or treadmill) is a really *efficient* way to increase your fitness - I'm hoping that it translates into an increase in speed and endurance
The session is this:
3 min @ 9.5 km/h (jog)
4 min @ 13.5 km/h (tempo)
2 min recovery (9.5 km/h )
4 min @ 13.5 km/h
2 min recovery
4 min @ 13.5 km/h
2 min recovery
4 min @ 13.5 km/h
3 min recovery
I've done a load of others which I might post about some other time.
Ciao!
John