I went to one this evening. My lower back likes to lock up and spasm about 1x per year. It is quite uncomfortable. Usually 2 or 3 visits for an adjustment and the use of a TENS unit that stimulates the muscles in the area with electric pulses get me out of it in a few days.
When I was training for a marathon about 15 years ago my right leg would start to go numb once I ran more than 10-12 miles. I went to a chiropractor that worked some magic to relieve pressure on a nerve. After the initial treatment a 17 mile training run was doable w/ no issues. I went again the afternoon before the race and managed to finish with full feeling in that leg so I guess it was a success.
