![the rather extreme stretch marks I've developed in both biceps after starting the gym. : r/mildlyinteresting the rather extreme stretch marks I've developed in both biceps after starting the gym. : r/mildlyinteresting](https://preview.redd.it/yulfmipx0c281.jpg?auto=webp&s=6c0f6f50cde6d1043177e2e176ee010cadd5b7b2)
the rather extreme stretch marks I've developed in both biceps after starting the gym. : r/mildlyinteresting
Zac Perna - I've made nearly every mistake in the gym since starting at 15. I didn't know what a macro was, I thought stretching muscles gave me stretch marks, I thought
![Stretch Marks Stock Illustrations – 370 Stretch Marks Stock Illustrations, Vectors & Clipart - Dreamstime Stretch Marks Stock Illustrations – 370 Stretch Marks Stock Illustrations, Vectors & Clipart - Dreamstime](https://thumbs.dreamstime.com/z/stretch-marks-medical-illustration-symptoms-30902947.jpg)