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Here is a good elliptical workout for 30 minutes with the following program
5 minutes of moderate paced warm up
Alternating High/Moderate pace starting at the 5 minute mark
30 seconds high
90 seconds moderate
30 seconds high
90 seconds moderate
Repeat til you hit the 25 minute mark

Complete the routine at 5 minutes of moderate pace til you reach the 30 minute mark.