I have to admit, I'm not a huge fan of lower body training, mostly because many of the best exercises (e.g. squats and lunges) are also the hardest. One exercise I do like, though it's also difficult, are Step Ups
. Step Ups work the muscles of the glutes, hamstrings and quads and you can make them more intense by raising your step or bench height and holding weights. If you have knee problems, you may want to avoid this exercise.
Do it Right: Stand behind a 15-inch platform or step and hold weights if desired. Place the right foot on the step, transfer the weight to the heel and push into the heel to come onto the step. Slowly step back down and repeat all reps on the right leg before switching to the left for about 1-3 sets of 10-16 reps according to your fitness level and goals.