I have been trying to add more HIIT training lately. Getting up to 8 sets is tough. But here’s something I want to point out to you.
The Tabata method of HIIT, which is the most popular, calls for you to sprint for 20 seconds and follow that by a 10 second rest period. You repeat for 8 sets.
You need to be in good condition to do this and you should start out modifying this. One good way is 30 seconds intervals followed by 30 second to 1 minute rest periods.
Anyway, I did 6 sets yesterday at 20/10. But my last 2 sets were not what you would call sprinting. It felt like I was but it was obvious the full speed was gone by that time. But I ran them as hard as I could anyway. I ended up walking a mile back home because of where I finished. That was definitely a cool down period.
The point being I was toast after that. But the training effect was there and there is no doubt it will help me increase my fitness level even higher than it now is. And, for those of you who don’t know, I’m now 62 years old and still running and exercising hard.