Right now I'm doing a 26.5 mile run and a 13 mile run. On the 13 mile run, after 6.5 miles easy pace (zone 2) I do 4x4 intervals- 4 minutes as hard as I can, followed by one minute walking, two minutes slow jog. 4 times. I decided to do them halfway into the run because I’d read to do speed work in the back half of a long run.
At first the limiting factor were my knees, or rather my right knee. I could tell I was straining it. It would hurt during and after the run. So I learned to run as hard as I could, but back off a little if I felt my knee hurting. I also focused a lot of attention on stretching the calves and hamstrings. Then the limiting factor became my breathing. I’d simply run out of breath, gasping for air. Most recently the last couple of intervals my limiting factor has just been running out of energy in the legs. They’ll just be be out of gas, getting rubbery the last minute of the interval.
Intervals are hard. Pushing your limit. I think everyone should do something that forces you to touch your max heart rate once a week. When I do the intervals I hold my phone in my hand because I have an app that will tell me my current pace. At the start of the interval it will be about 5:30-5:45 (mile). Then mid interval I tend to fade and it will go over 6:00. On the last interval I will fade to 7:00. Then I always sprint the last 30 seconds of each interval and get it back into the 5’s. I will also go past 4 minutes to make sure I hit max heart rate, or at least 95%. If my numbers sound slow remember I’m 62.
#Kento - you should try them. You can tell you’re tapping into different energy systems. Working muscles in a different way. I don’t get sore after running 26 miles but will get sore (calves) after doing intervals.
Other than that I do one set of push-ups every morning at the end of a 20 minute stretching routine. One set to failure which is now 40-45.
Oh, and one day a week 1-1/2 hour barbell routine. I hate doing the barbell, but it’s medicine.
Finally there’s surfing. I don’t consider it a work out, training or exercise. How lucky are we that we have found something we love to do that keeps us in shape? No one has to motivate me to surf. When it’s good I’m running across the sand to get to the waves.