A few years a go I was going to the gym, the first time ever. ( at least 5 years a go)
The rowing machine was hard. 30 strokes per minute killed. Every second I rowed was one closer to the end. I had the resistance set to low and it hurt. I dreaded the machine.
Last night, I did my first interval training session on the rowing machine.
The resistance was set to maximum. While doing the high intensity I was up near 40 to 45 strokes a minute, while doing the low intensity I was still doing 30.
Oh yeah, I am a lot fitter than I used to be. The thing is I now know how much further I have to go.
Still it is a great feeling to see such a huge difference. I can feel it today though.