Window washing and physical outdoor work is usually hard, and therefore you must observe early marks of fatigue in hands, for instance. Epicondylitis settles in fast, even experienced cleaner like Luke wears a support from time to time. But there are countermeasures you can take, and you should exercise in a regular fashion, not to develop huge muscles, but to keep your back and hands and feet in good condition. Greetings from a 52-year old cleaner/lumberjack/gardener/whatever.
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