Lunges are a good body weight exercise that can be can be performed anywhere. They primarily work the glutes, quads and hamstrings. The core and lower back muscles also get developed as they work to stabilize you and provide balance.
There are a few variations you can do as well. Side lunges target the inner thigh. Reverse lunges can be helpful for those with a knee injury.
Runners will find lunges improve flexibility in the hip flexors.
Like all exercises, it’s important to have good form. This video will show you how to do a lunge properly so you don’t injure yourself and will get good results.