The Squat Thrust is a full body exercise, particularly working the scapular stabilisers, core, glutes and quadriceps. This is also a fast paced exercise which can help to improve your cardiovascular fitness.
Set yourself up in a press up positions with your arms shoulder width apart. Form here, jump your feet in, so that they come all the way through and you are in a very compressed position - almost like a scrunched up ball. Repeat this, jumping your legs in and out between the two positions.
Try to keep your head and shoulders stable throughout the exercise, rather than letting them rock forwards and backwards as you might find starts to happen.