The best way to burn calories using yo-yos, is to throw 4A with your eyes closed in a big asphalt parking lot for an hour.
You will probably put 20,000 steps on a Pedometer and burn about 11 calories.
On a more serious note, there is nothing currently available that can accurately calculate the amount of calories you can/might/do, burn during a throwing session.
Consider this for better proper mental .alignment
Approximate how many calories you might burn in an hour doing simple calisthenics: push ups, jumping jacks, sit ups, chin ups… all the ole school exercises people use to do in school when they actually made you work out.
Probably work up a good sweat no doubt. And you calculate you burned X number of calories.
Unless you are standing in direct sunlight at high noon in Texas, you could yo-yo for 3 hours without sweating a drop.
You could probably burn more calories doing dumbbell curls holding a Twinkie in each hand.
As one of you guys already said, some of the measuring devices calculate calories burned, based on swinging arm movements/while walking/running.
…. So, you could be literally standing still while throwing so your device will be registering your arm swings as leg moving and over calculate the burn amount.
Sorry I don’t have a good solution for calculations… but I think the amount of calories burned while yo-yoing is ‘not many’.
Now, on a Positive note, consider this> One of the things that inspires sedentary behavior is the lack of endorphins in your system
Endorphins create a more positive mental outlook and subconsciously inspire a person to move more.
So even though practice, yo-yo sessions may not seem like big calorie burners in the short game. When you consider the endorphins that your body generates while throwing yo-yos and having fun will actually work for you even more after you’re done throwing.
So throwing keeps your mind, active. Generates a higher level of positivity. Resulting in the production Of endorphins, which will keep you motivated and in the process, you will burn calories because you will feel more like moving and less like jelling out on a beanbag chair playing Candy Crush.
I would not kid you.