Strength training has been found to be effective and safe in reducing the risk of lymphedema because the muscle contraction helps move the lymph along the arm. In any case, and after doing any strength exercise with the arms, it is highly recommended to do pumping exercises to promote lymphatic circulation; to do this, place your hands at face level or higher, and open and close your hands 10 times.
Source: Geisalus No. 30
https://www.geicam.org/wp-content/uploads/2020/04/REV_GEISALUS_30_WEB.pdf#page=4
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