Non-specific lower back pain has become a major public health problem worldwide. The life time prevalence of low back pain is reported to be as high as 84% and the prevalence of chronic low back pain is about 23% with 11-12% of the population being disabled by low back pain. There has been little evidence that alone Swiss ball exercise is effective in reducing pain and Oswestry Disability Index but Iyengar yoga will be more effective and Iyengar yoga is effective in improving core muscles TrA strength but Swiss ball exercise will be more beneficial. This is the comparative study to check whether Swiss ball is effective or Iyengar yoga is effective.