I started my Kung Fu class about a month ago and have been lifting for a few months, but I just started going really hot and heavy on the Kung Fu class for like 2 weeks now. One reason I'm exercising like this is so that I can feel better and have more energy, but so far all I've felt is soreness and draggin my ass. How long does it take for all this work to build me up to the point where I feel good and energetic?