No problem, I enjoy trying to help.
As to your legs and the frequency, you will be amazed at what the human body will adapt to. You will be sore at first, but you will get used to it rather quickly. Of course, it would be sensible to adjust volume slightly to help with the transition.
James 1:16-17 ESV
Do not be deceived, my beloved brothers. Every good gift and every perfect gift is from above, coming down from the Father of lights
With God's help...Mens sana in corpore sano