Tabata is a very efficient method to shed extra fat while also building lean muscle. It was created by a Japanese professor who discovered that 8 rounds of high intensity (:20 of work and :10 of rest) was the best pattern for the goals mentioned above.
Even though it might be a bit boring because you're doing the same exercise over and over again you want to do them with high intensity so that it really works. Your first 4-5 rounds would feel easy and the last rounds (6-8) would be more challenging so try your best to complete the same number of reps on each round to keep it efficient.
You can read more about Tabata here, in Coach Marife's article.
You're going to love the result afterwards, keep pushing hard!