I don't think an hour a day is too much--that's what I do--but I am concerned that you would be doing the exact same thing every day. This is a problem for several reasons: 1) You're likely to get bored with it really fast and it's going to be hard to motivate yourself to keep doing it, 2) You're body is going to adjust to the exercise you're doing and it just isn't going to be as effective, 3) You're using the same muscles over and over again with no break, which could lead to overuse injuries.
So I think it would be great if you added in some variety. Strength training three days a week instead of the cardio would be a great option. Building muscle will help you burn more calories and also help you look more toned.
Also, maybe try some different cardio exercises. Running is great cardio exercise. If you aren't ready to run yet, try walking at an incline, walking at a fast pace, or alternating between running for short spurts and walking. Maybe try yoga or pilates (either classes at your gym or a DVD) (not really cardio but still good for you). Try some dance classes or DVDs. Jumping rump. Going up and down stairs (or a stepmill if your gym has one). Swimming is also great cardio exercise.
I also think that if you aren't giving yourself a day off, it's worth giving yourself an easy day, just to give your body a break. I normally work out seven days week, but on Saturdays I swim, which is a pretty easy workout for me and also something that I really enjoy. By the time Saturday rolls around, I'm usually ready for something easy and enjoyable. So maybe one day a week, instead of doing the cardio machines, you could do something less intense, like taking a long walk or an easy yoga class, as your exercise.
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