Circuit training is a great way to build muscle and torch body fat at the same time. Sounds simple enough, right? But as you know by now, simple doesn't mean easy.
Perform the first circuit as quickly as you can, but make sure you're doing the movements properly. Don't use weight that's so light you can't even feel it, but don't go so heavy that you have to rest after every rep. If dips are difficult for you, feel free to use a band or help from a machine to get them done. If you're in a commercial gym, bring your dumbbells over to where you're doing dips so you can get from one exercise to the other quickly.
The second circuit is a tad more complicated. Each time you go through all three exercises, you'll decrease the reps by two. If push-ups are easy for you, I challenge you to perform clap push-ups. Increasing the difficulty of the workout will slow it down, but that's not a big deal if you're pushing yourself!
Circuit: 3 rounds without stopping, then rest 5-10 minutes
Circuit: 1 round without stopping
Don't forget to write down your circuit times, what weights you used, and how you felt after finishing the workout.