 Reduced lumbar multifidus muscle contraction has been observed in patients with low back pain LBP. Currently, considerable evidence supports spinal stabilization exercises for treating LBP, including lumbar multifidus muscle activation exercises. Clinicians often apply a tactile stimulation on the muscle in addition to verbal instructions to ensure muscle activation. However, whether or not the addition of tactile stimulation would increase muscle activation has not been studied. Therefore, the investigators plan to use electromyography EMG to examine if addition of tactile stimulation to verbal instructions would increase lumbar multifidus muscle activation in healthy adults and patients with LBP. 