Good arm strength building exercises
I'm pretty weak and I need to build some strength. What are some good arm strength building exercises? I can't go to the gym. Are push ups good? Is lifting a heavy backpack with your arms fully extended (to make it harder/heavier to lift) good?
How much strength do you lose if you don't train? I'd like to get to a good level of strength, and I would like to retain 80% of that strength without much training afterwards. Is that reasonable?
Thanks.
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