Exercise effectiveness is really about the QUALITY of exercise, not its duration. Working up a sweat is really an indicator of environmental conditions (temperature, humidity, etc) rather than an effective workout.
Your heart rate is definitely a much better indicator of cardio effectiveness - once you can work out for 30-40 minutes, you are much better off with adding more intensity to your workout, rather than more time.
And strength training is ALL about how closely you are challenging your muscles to their maximum potential. You should be lifting heavy and aiming to fatigue your muscles in just 4-12 reps (fatigue means you feel you cannot do another rep with the correct form). Using light weights where you can do 20+ reps, or doing them very quickly, just isn't effective strength training.
The other thing to watch is whether you are truly eating 1500 calories. You need to account for every lick, bite and taste (including beverages). Also, portion sizing matters - if you are just 'eyeballing' things, it is easy go over 'standard' portion sizes in calorie counters. Take a look at www.sparkpeople.com/resource/nutrition_art
for some guidelines. (Nothing personal intended in the above - it's just a common source of error).
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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