FancyPunk

I'm in the process of getting my alt cert in my state (USA). I plan on working as a full time teacher in the fall. Until I have completed my certification, I have no guaranteed position. Despite this, I am 100% confident that I will find work. I have a B.S. in biology with a minor in chemistry, so I will be taking subject matter tests on both subjects and plan on teaching one or the other at the high school level. My backup is to teach middle school science.

The only reason I'm considering subbing this late in the school year (end of year is May 20 in my area) is my daughter. I quit my job in healthcare in November so I could spend more time with my kiddos before changing careers. I hadn't

I've been working toward getting back in shape after 3.5 years and 2 pregnancies. I've got into a rhythm of going to the gym 6 days per week. Currently, I alternate SL in the weight room one day and c25k on a treadmill the next. I have just noticed that if I engage my core muscles while running, the rest of my body seems to have an easier time, but my core wears out and I can't keep it up for long. I keep the same pace on the machine regardless of engaging my core.

So here is my question: have I just been running with bad form my whole life? It isn't easy for me to run with my core engaged for very long. If I have been running with bad form all this time, how do I work up those muscles? Sho