Muscular flexibility has long been recognized as an important component of physical fitness, a fundamental component of basic human function, and is essential for good health as well as helpful in improving athletic and overall performance. The primary aim of this thesis was to compare the effects of stretching vs eccentric strengthening in improving the flexibility of the hip joint. There were 24 volunteers who took part in this study from the university of Debrecen, and they were evenly split into two groups, an eccentric training group and a stretching group. The intervention took place over a period of 6-weeks. Measurements were taken before and after the intervention period. According to the findings, there is evidence that both stretching and eccentric training can improve the AROM of the hip in certain planes of motion. However, the active stretching group produced greater significant improvements.