Thanks all,
I thought about Lin's explanation of the pain worsening, but I quickly discounted it because I have never had a problem with my calves or anything serious with my feet. My circulation has been poor lately, cold feet, cold hands, but I did not have this discomfort in my hands, just lower legs.
And for overheating, it is entirely possible, though I was wearing light pants. I'll try shorts tonight. 
Should I work on getting the active meditations down before moving on to the sitting exercises, or is it fine to move right along? I was hoping I could improve my circulation a bit first, with the yoga I've done in the past, my legs would be terribly numb just after 20mins. Not very enjoyable. Hell, no reason not to try, eh?
Live long and prosper!
