During visits 2-13, participants will attend 2-3 sessions per week, with a minimum of 48 hours between visits, and must complete all study visits 6 weeks after enrollment. Participants in the intervention group will perform 3 sets of low back extension exercise on the Roman chair until volitional exhaustion. The three sets will be performed to volitional exhaustion or 20 repetitions, whichever comes first. If more than 20 repetitions can be completed after a set the investigator will add resistance according to the NSCA's guidelines (2.5-10% increase).

Participants in the control group will not complete the low back extension exercise and will be told to continue activity as usual. All participants will complete a training log and detail the type of resistance exercise performed, the number of sets and repetitions completed, and the weight used.

Participants in the intervention group will perform 3 sets of low back extension exercise on the Roman chair until volitional exhaustion. The three sets will be performed to volitional exhaustion or 20 repetitions, whichever comes first. If more than 20 repetitions can be completed after a set the investigator will add resistance according to the NSCA's guidelines (2.5-10% increase).

Participants will perform one set of back extension exercise on a 45-degree Roman chair until volitional exhaustion. Pressure Pain Threshold applied over the low back will be examined before and after exercise.

Ultrasound imaging to assess muscle thickness of the erector spinae and the multifidus muscles will be completed.

Back extensor strength will be assessed using maximal voluntary isometric contraction of the back extensor muscles using a handheld dynamometer.

The Biering-Sorensen test will be performed in which participants lie prone on a treatment table with the lower body secured to the table. Participants will be instructed to cross their arms over their chest and maintain their torso in a horizontal position with the upper body unsupported, parallel to the floor.