How do I measure calories in my videos?

First, why numbers can vary

Around the middle of last year, I got the idea to measure the number of calories burned for all my "sessions". This is often one of the main measurements that people track after a workout. I'm not going to go into the details of EPOC effect, differences in calories burned during weight training and pure cardio. In this article I just want to uncover what to see behind these numbers when you finish jumping.

Jumping has proven itself to me several times over as one of the ultimate calorie burning exercises. When executed properly, the intensity and structure yields over 10kcal/min - a high number. Basically, you can say that in 20 minutes of jumping you will always burn at least 200kcal. Again, these numbers are VERY approximate and depend on a lot of factors, examples:

- Gender, age

- Physical condition

- Proper technique of the exercise

- Ambient conditions (especially temperature and humidity)

- Previous activity

- Structure of the training unit (+ intensity)

- Specifically for Jumping also the type of trampoline

Therefore, it could very easily happen that your numbers will come out a little differently each time for the same video. Above you can see just a handful of factors that affect the measurements 😊 Even in my 20 minutes sessions you can sometimes see that I get to ~240kcal, but for example I finished January 2021 at an extreme 297kcal in 20 minutes - I think I measured this particular session in a slightly "warmer" room 😊. However, on the positive side, the 200kcal in 20 minutes mark is not a hard nut to crack for Jumping (thanks, trampoline! :-D)

This was achieved by 60 minutes of Jumping and 30 minuts of HIIT training
1000kcal - 60 minutes of Jumping and 30 minutes of HIIT


If I'm measuring calories for a video, I always use a Polar OH1+ wrist band. It achieves roughly 95% accuracy of chest straps - these are still considered the most accurate method of measuring heart rate. However, a lot of us, myself included, can't bear to wear a chest belt when jumping. So I'm happy to sacrifice those 5% for convenience 😁

The downside of these belts is that you simply don't have them around all the time, so they're not really suitable for daily measurements as you're always thinking about the next thing you need to carry with you. And this is where the smartwatch era comes in. Evolutionarily, these "wearables" have evolved from simple pedometers, to smarter bands, and finally to the current smartwatch era. These also very often show relevant data.

However, the accuracy here fluctuates more due to the optical heart rate sensing technology, which also has to fit into the compact size of the watch. It also depends on the type of training, the sports activity and, of course, the manufacturer. So if you work out like crazy, can't breathe and the calories just don't jump in, don't panic :-)

But about that some other time, because it is a topic worthy of a separate article 😊 In my "Sessions" and compilations from them I always show the data taken with the Polar OH1+ 😊 So I hope you try to beat me in my measured numbers :-P


Proč se čísla často liší?

Zhruba v polovině loňského roku mě napadlo měřit pro všechny své „sessions“ počty spálených kalorií. To je často jeden z hlavních ukazatelů, který lidé po cvičení sledují. Nebudu zabíhat do podrobností EPOC efektu, rozdílů pálených kalorií při posilování a čistém kardiu, v tomto článku chci jen odkrýt, co se skrývá při Jumpingu za těmito čísly.

Jumping se mi již ně