Not, in my humble opinion, a good idea. As several folks have said, piano playing (or other keyboards, except maybe carillon!) is not about strength, but speed and articulation. And, to a certain extent, stamina -- the ability to keep it up for a longish time (my right hand still gets a little weary on Schurbert op. 90 #4, after all these years... or maybe because of all these years?!

). The best way, again IMHO, to get there is practicing... up to the point that your arms might be a little tired, but not much beyond. Other finger agility exercises can help too -- for instance, learning to touch-type (NOT txt n an iPad!!!) is great.