@ejc420 I've got gimpy knees so I do a lot of low impact exercise at the gym. Most cardio is boring. Doing intervals helps make the time go by faster, particularly if I'm the one setting the interval rather than using one of the interval programs on the machine at the gym. Usually, after a warm-up, I go one minute as hard as I can and one minute to recover. With machines like a rowing machine, I just go harder and faster during the hard minute. With a bike or elliptical, I increase the resistance. With a treadmill, since I don't run, I increase the incline while I continue to walk at the same pace.
Also, I watch tv shows on my phone (woo-hoo! for a gym with free wifi since I don't have unlimited data). The key, for me at least, is that I pick a show and ONLY watch it while I'm at the gym doing cardio, core and stretching. I've found that something that's more character and drama driven rather than episodic and action driven works best for me. The West Wing, Gilmore Girls and, my current favorite, ER have worked well. Alias, Warehouse 13 and most crime procedurals aren't as good (but, YMMV).