I'm a 27 year old white male. I have been tall and skinny my entire life. 6' 145 or so..
I've always had a small dip/concave under my sternum. On the left side you could feel a bone( i think its a bone) protruding a little which looked to be helping making the concave shape. It was a little flexibile and if I applied pressure, it could be pushed in a little.
I work out and this week started doing some exercises I normally don't do with my own body weight in my house. I believe I was doing dips with a couple of chairs when I heard a little cracking in my chest, I didn't think anything of it and in fact I thought it was the floor beneath me.
Today I get in the shower and I noticed the "hole" in my chest is gone and you can no longer feel the little bump protruding out.
I'm just trying to figure out what's going on here. Have I had something out of place for the past 27 years? I wish I would have done that exercise much earlier.
with a little more research I think I have an idea of what was going on. Your costal cartilage connects your first 7 ribs to your sternum. It appears that where my 7th rib connected is where the concave was. This bump that I assumed was bone was probably the costal cartilage. It wasn't in the correct place and had be shifted in front of my sternum. When I was stretching and doing an exercise, I must have put enough tension on the cartilage to pull it back and pop it into the place it is supposed to be.
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