Learning and playing the classical guitar often creates a level of tension that is detrimental. This often goes unnoticed. This can cause the hands to tire, cause a lack of coordination or generally poor execution. Because we don’t monitor this it often goes unnoticed. Try playing a short piece varying the degrees of tension. Start somewhere around levels 4-6, (enough to play, not too tense), increase to levels 8-9, (too much tension, making it difficult to play), back to levels 4-6 and then 1-2, (so little tension that you can’t execute). Finally return to levels 4-6. Practice for no more than 3 minutes per day for two weeks and you’ll begin to gain control over this silent monster!