Sumo jumping squats are explosive movements, you get more bang for your buck than you would in an ordinary movement. So, they are vertical jumps where you start to squat down, jump as high as you can, and come back down and keep on going. Even if you have knee problems, you can make adjustments in terms of how low you go down, the depth of your jump, but by doing an exercise like that, not only do you significantly work all of your leg muscles, your quadriceps, your hamstrings, your glutes, your calf muscles but you also get a huge cardiovascular effect.