I have said it before and no doubt I will say it again: If pressed for time, don't skip the gym altogether — just shorten your workout.
When you're pressed for time, use this quick elliptical workout I created. It's only 22 minutes long including warm up and cool down, and features really short and effective intervals. Using quick intervals makes the workout intense and is great for burning calories. Remember to work honestly within your rate of perceived exertion (RPE) and work between easy (1-3), medium (4-7), and hard (8-10) amounts of exertion.

Keep reading to see the workout.