I am 5 ' 6 1/4" tall and there is no way Im telling my weight, until I join the gym and work out 5 times a week!!!!
I don't know much about working to lose weight,
I suppose running and cycling machines are excellent
I noticed some running and cycling machines with a pulse detector , you put your hands on the bars and it measures your heartbeat. This looks very good to me, because I wouldn't want to work the heart too hard.
This lets you -keep an eye on it-.
Judging purely by what I recall from the label on the machine. Burning Calories can/should be done at a relatively low heart rate.. No more than like 140 beats per minute are necessary.
I haven't researched this, but I would suggest that if it gets too high, take a break. Come back.
You would come back, because the idea is not to kill yourself, meaning, metaphorically too, not to work yourself till you're red in the face. So don't let your heart beat get too high, and then you probably won't be doing anything that would put you off coming back. And you won't be endangering your health.
Alot of people get a test at the gym where they are made to run like hell on a running machine (under supervision) to test the limits of their fitness. Don't make the mistake of thinking that exercise should be like that.
If walking/running outdoors, I'm sure I once saw a device, a little thing that straps onto the wrist, that measures your heart beat and beeps if it goes above a certain number , so it paces you.
I would add.. Get an idea of when your heart beat is higher than you are comfortable with, you would feel it, you would know. And look at what the machine measures your heart beat as. And don't exceed that. If you do then come off the machine until your heartbeat lowers.. I reckon that with burning calories, it's more about how much you do than how hard you push yourself.
And if you pace yourself, not making yourself red in the face, then you can get alot of exercise in and remain comfortable. And take breaks from time to time.