Good afternoon. I am a 73 year old male, although age and sex doesn't seem to matter in the StrongFirst world. I have managed to progress to 70 lbs kettlebell with two-arm swings. My question is how do I begin to incorporate one-arm swings into my training routine? Specifically, is there a formula for selecting the starting weight or is it pretty much trial and error? Also, should one use the same weight for left and right arms? Many thanks for the advice.