Any suggestions working out in an apartment without disturbing my neighbors?

I'm a college student, and I'm a fitness coach. Right now, I'm running a challenge group for P90X3 that just came out so it's important for me to follow the program with my clients. A lot of the time you are airborne and you are jumping. I happen to live on the 3rd floor of an apartment building and the people below me always hit the ceiling when I work out. These are only 30 minute workouts, but the people who live below me get up for clinicals in the early hours and the only time I have to workout is in the evening because I also work as a dental assistant and work until 8 or 9pm. Is there anything (besides moving to the first floor, which isn't possible), that I can do to minimize the noise? I don't want to disturb anyone, but I want to workout!