I'm feeling a little pain in the lower right part of my back. After biking a lot today, could this be muscle pain? The pain increases slightly when I breathe hard.
Yes, it could be muscle strain, especially after a lot of biking. Overuse or awkward posture can cause lower back muscles to become sore, and muscle pain often worsens with deep breathing or movement. Try rest, gentle stretching, warm compresses, and staying hydrated. If the pain becomes severe or persistent, it is best to see a doctor.