SimpleLearn to breathe with your diaphragm, practice it all the time until it becomes a natural reflex.
Came across this great article on Steve magness's twitter site CLICK HERE
Anyway on a session of 20 x 400m i decided to check my breathing, I found i was only breathing into my upper chest, after changing to breathing deep into my belly i noticed the following;
I felt stronger and more relaxed.
Able to keep my pace going with less effort.
Recovered faster after each effort.
Optimal breathing for runners CLICK HERE
I've never really thought about mybreathing when running before but after doing some research I've found that belly breathing increases the amount of oxygen to the body and muscles and hence increasing performance.
20 x 400m
Felt really strong on the session, I was only meant to go up to 10k pace [5.44] but soon found myself hitting 5.25 pace and faster, in fact I finished the session feeling like I could have run another 20 efforts!