I found using a Theraband Flexbar helpful for my medial epicondilitis (golfer's elbow). It's a thick column of rubbery material which you twist in various ways

I found using a Theraband Flexbar helpful for my medial epicondilitis (golfer's elbow). It's a thick column of rubbery material which you twist in various ways for resistance exercises. You can also do exercises which mimic the effect of the dumbbell exercise which the parent commenter described. https://www.physioparts.co.uk/thera-band-flexbar https://www.physioparts.co.uk/thera-band-flexbar I have the green one seems to be about right for my needs.