<p>The definition of exercise/cardio is when you increase your heart rate to about 65% of it’s capacity. People often confuse the terms “thin” and “fit”. Being thin has nothing whatsoever to do with being healthy.</p>
<p>“I spend around 45 minutes on the treadmill, mostly walking fairly slowly at the maxmimum incline”</p>
<p>From what you’ve written, it seems as though you haven’t been “exercising” for the past months. Being 50 years of age has nothing to do with the entire situation unless you have major heart/health complications.</p>
<p>Firstly, what you would want to do will be a 10 minute cardio session to get your heart pumping. Next, some light leg workouts to stimulate your metabolism and the muscle fibres in your legs, and build their endurance so they can withstand the intensity of the hike. Preferably light weights with higher repetitions (in the 15x range). Weighted-Lunges will be a good start. As time goes by, you will learn to incorporate weights into an entire body workout:arms, chest, back, shoulders etc and your workout duration will increase. You have to realize that many other muscle groups are strained when you hike, especially your back.</p>
<p>After about 30 minutes of continuous weight training, hop onto the treadmill. Start with a walk, and increase the speed until you are jogging (a speed that challenges you). After a week of this routine, you will realize that your endurance has increased significantly. Now it is time to up the scale, and gradually incline the machine. You will be amazed by your achievement.</p>
<p>Do not forget to stretch before and after your workouts, as you do not want to injure yourself. Also always keep yourself hydrated and sleep! I can never stress that enough. If you smoke, kick the habit. Your diet is also an important key.</p>
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