So, I'm generally in good shape, but I can't seem to run for my life. I'm not an athletic person but I'm not a couch potato, either. However, I just joined a boat rowing team and part of the training requires a lot of running for building our endurance. They're measuring our improvement and I would like to know any tricks that might help me get better at this. The test is running 4 laps of 400m as fast as you can. My time was 7m50s which I understand is pretty bad(the best time was 5m34s I think). I swear I really gave it my all, I was trying to breath properly(long breaths, inhaling through the nose, exhaling through the mouth) but I ran out of breath and started breathing way too fast through my mouth.
Also, I always get this pain on the side of my rib, it feels like air is trapped in my lung or something. Any stretching or exercises I can do to avoid that?
Thanks!