1. - You said more exercising.
2. Lower back pain is usually caused by an injury to a muscle like a strain, or maybe a sprain, poor posture, improper lifting, lack of exercises or excessive exercising, these are all very common causes for back pain, and of course there are the severe cases like ruptured or bulging discs, bone fracture, arthritis, osteoporosis, shingles and other illnesses like spine cancer and infections.
3. I am going to keep up the healthy eating and the exercising and we'll see where it goes.
4. And then to ANSWER the question about whether someone should wear a face covering during EXERCISING.