170bpm is to high. gyms can be very competative, and motivating and you might go over your THR without you knowing. The training heart rate for every one is 170 less your age. and + or - 10%, so you should train at about 120bpm, + or - 10%. so between 110 and 130bpm. Yes get a 2nd read out, but you should not buy one. dont rely on a machine, as this limits your ability to do it yourself when ever you feel you should. Its easy to take your pulse rate, take when resting and during exercise often to get use to it, find your pulse at the side of your neck or on your wrist, find a clock and take it for 6 seconds and times it by 10. or take it for 30 seconds and double it. The read outs on some gym machines are not reliable.
Well done getting to your normal weight. you should exercise every day, to maintain it for the rest of your life. With your history and age, to prevent any risk of a heart problem, in the future, I would suggest less then 10 minutes of training to your THR level twice a day rather then one long session every 2nd day. ( which puts your heart under stress ) Once in the morning and then in the afternoon or evening. Now that your at your correct weight start working on improving your body shape so improve the part of your body thats still a bit of a problem, example, if your tummy is still abit flabby, and you cant hold it in for hours at a time, with a good strong posture, you should start doing more core work.
I only help obese and over weight , lose weight
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