There is nothing wrong with doing above 20 repetitions, just don't expect to be gaining much mass or strength. At that point, you are primarily increasing muscular endurance.
Toning is a function of lower bodyfat. Lose fat or gain muscle mass, that's how you tone.
There is no best repetition range. You should never stay in one range. I use different ranges for different bodyparts too. I like 8-12 for core work, but 4-8 for a lift like the bench press.



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