Have you tried high intensity interval training yet? You may have heard it referred to as a HIIT workout or Tabata training. My favorite at-home exercise routine for when I really want to work up a sweat is TurboFire (developed by Chalene Johnson and distributed by BeachBody), and it incorporates a lot of HIIT training. Check out this video to see how much fun these workouts are. If I only have a short amount of time to workout, but want to make the most of it, I like to use Tabata routines (they are 4 minutes long!). There are hundreds of routines just waiting for you out there in the wilderness of the Internet. Like this one:
Whether you would like to develop your own interval training routine, or use one you found somewhere, it is highly advised to invest in an interval timer. They are only around $20 and you can set your preferred exercise and rest times according to the training method you choose. I love mine; it is so easy to pick a few different exercises, plug in your intervals and go to town (I used to time my runs with it, too, back in the days when I was trying to be a runner).
Learn about the various types of interval training in the infographic below.