Arms that will not lift or punches that land softly are classic dream images of powerlessness. Tradition reads them as a situation where you feel your voice or your effort is not counting.
Where in your waking life have you met something like this lately?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.