This report gave a summary of an investigation into the effect of home therapy exercise programme in the management of mechanical low back pain, considering the pain intensity level, flexibility of the lumbar spine and functional ability. The participants were ten. Prior to the programme, there was a pretest, then a twelve-week therapy exercise programme followed by a posttest. The result was analysed using descriptive statistics of range, mean and standard deviation and inferential statistic of paired sample t-test at a significant level of 0.05. The result revealed that there was an increase in functional ability due to the therapy exercise programme and reduction in pain intensity level but there was no significant effect on flexibility. It was therefore recommended that secretaries should endeavour not to sit all day but should stand at some intervals to stretch their back muscles. Low back exercise should be performed both at home and at work management of all institutions should enforce lunch breaks and fitness programme aimed at back care for staff.