People who have tight hamstring muscles tend to stand up through impact, losing speed and power in their golf swing. This stretch is good for people who tend to sit most of the day and have tight hamstring muscles.

Lie on your back with both legs extended on the floor.
Lift one leg straight as you pull it towards your chest either at your knee or calf muscle.
Hold the position of 8 to 10 counts and return to the start position.
Repeat on opposite leg.
Do 8 to 10 repetitions on both legs.
If either knee bends, you will need to work on flexibility in your hamstring muscles.