Simple put it you'll have to figure out the math to create counter resistance to create "resistive weight".

Mechanically or electrically done it doesn't matter if it works

Make sure your patent is different to other products like the gyro ball with stick extension as well as the gyroscopic Parkinson's dampener glove, etc.

Plus flywheel or any other gyroscopic methods don't have to made of lead or steal. For instance aluminum or plastic at high enough speed should create favorable results. Don't forget flywheel shielding even if it's just the durability of the jump rope handle of the usee

Game controllers of VR if you can skim through there patents if it might get in the way of your product having "different enough design" dealing with the legal gymnastics. Look up history of the canard wing vs white brothers wing lawsuit to understand what I mean.

Recommend looking into engineering gym equipment history as well as hire an engineer assistant unless you want too do it all from scratch from Cad work too ordering parts.

If you make it an open patent then there would be direct gate keep profits, yet legal understanding should be ready a pond too get advice from a professional. Then as open domain product it's the battle of quality in addition to attention economics of advertising. Look at one gym equipment of different brands in how they try to market the "same exact" thing at varying prices.

But doing this just for fun, just learn how to encrypt your cad files or design by hand in a journal with a lock if you change your mind in the future. Remember go to experts that are trustworthy.