If you regularly exercise - especially in busy gyms - in 3 sets of 12, 15, or 20 repetitions of exercises, you'll be familiar with your brain going off course while the body goes through the sequences. Somewhere you suddenly realize that you've lost count and are in a quandary about whether you're on the second or third set! How can you solidly concentrate to prevent that?
Reliably learn to count to 20 in 3 foreign languages that you don't speak. Learning to count to 20 in each language will cover the number of repetitions whether they be 12, 15, or 20. During your next exercise use language 1 for the first set, language 2 for the second set, and language 3 for the third set. You'll see how sharp your brain will stay on counting! Counting in a foreign language will force the brain to concentrate on counting. If you count in foreign languages that you speak, counting will be more automatic [autopilot] than counting in languages that you don't speak.
But regardless of how automatic the counting be, the brain will still be forced to concentrate on counting. Hence you won't go off course. You may even find fun in seeing how quickly you can think of the next count word. And also whether you can master counting the sequence more smoothly the next time you count in this language... After all, it's an exercise, right?:)
Learn the counts in 3 more foreign languages that you don't speak. You'll now have a stock of counts to 20 in 6 foreign languages. Always vary the order of the languages. If you have only 3 languages in stock, you'll be limited to only 3 variations. They will soon get automatic too. If you have 6, you have more choice to play with. Again, it's an exercise, right?:) And in this case choice is better than no choice because you can more variations of combinations.
You can also add counting on the fingers as your internal voice counts the words. You don't have to move the fingers. Just feel each finger of which the turn it is when its turn comes. Counting on the fingers will add grounding and support.
Or if you're more visual, you can add visual counting. See an image of each number in the mind while the internal voice counts it in the foreign languages. You can even see every number in a different colour if that makes it fun. So it can be an exercise of creativity as well as of the body!
Would you like to exercise your creativity in other aspects of life too? I'd gladly be your personal trainer!