the only problem with the jump rope is that you'll get tired faster and less likely to go on an hour. as for myself, i find the elliptical an easy effective cardio work out. i can be on there for an hour or more because although i am working out my legs and arms, i still don't find myself out of breath to the point where i need to stop.I really think the spin bike is the best for weight lost. you burn a lot of calories, I work out on the elliptical to iam alot more exhausted from the bike. and notice my weight stays down more from the bike.