[NOTE: I also enjoy working out in the great outdoors but that I will post later]
In addition to my interval training, I do 30 minutes of circuit-training. Now the reason I circuit-train is because a) it's a fast and efficient way to blast A LOT of fat and calories and b) my boyfriend works out for only 60 minutes which means I have to incorporate every muscle group within that hour. But if I'm working out by myself, I can go for hours because uhh...i'm obsessed! haha
Circuit training includes short-bursts of intense resistant-training and cardio combined. Typically, my resistant training involves 20 reps per each workout with the total of three sets and in-between OR incorporated to each resistant workout is a high aerobic exercise. Ever since I've been circuit training, I've gone through a lot of trial-and-errors with a couple of workouts. Now these links are a couple of them that I like to follow routinely. But also, to workout effectively, I change up my routine every 4 weeks or whenever I feel like I've reached a plateau.
Follow one or incorporate one into another to make-up your own routine!