Thundering Elephants

Day 2 of the running plan completed. Does everyone feel like a galumping elephant when they first start running? I see all the other people running around me and they seem so fleet and light-footed while I feel like I should hear shouts of "stampede" or "Earthquake! Take Cover" as I run past! I hope it's going to get better, Zoey and I definitely did not enjoy Day 2 as much as Day 1.