Brief Answer: Rib nerve irritation. Detailed Answer: Hello! Thank you for the query. Such sharp chest pain which last for few seconds is caused by rib nerve irritation due to exercises you perform. It can be caused by some spine problems, rib nerve inflammation, however most probably it is just an irritation due to rib momentary dislocation. You may try to have better warmup in this area before you start exercises. Magnesium supplementation can be also beneficial. So if your pain does not radiate to the left arm, jaw, no shortness of breath, nothing serious is happening. Hope this will help. Feel free to ask further questions. Regards.

---

Brief Answer: . Detailed Answer: I just mentioned inflammation as a one possibility. But in your case, some ribs movements are causing it, not inflammation. This is very common that sharp chest pain causes a lot of stress and worsens the symptoms. But heart pain is never sharp and well located. Heart pain is dull, squeezing, located on the left side. It radiates to the arm or jaw. You are young person and heart problems are hardly possible at your age. Regards.

---