Probably the closest thing to hiking that you can do in the city is to go for a walk in the park. If this business of hiking is really new to you going for a walk in a park is probably a good way to get started. Find a park that has some unpaved walking paths or just some open areas where you can get a feel for walking on unpaved surfaces. I find walking on unpaved surfaces much more pleasant than walking on concrete or payment. The hard city surfaces give my feet blisters faster than walking on bare ground
Hills
Hiking up and down hills and mountains requires care, especially on slopes covered with loose gravel or loose dirt. Keep your knees bent and use side-stepping maneuvers on the steepest parts. A hiking stick or even a pair of hiking poles can give you an extra stability. Take your time, breathe, turn around and enjoy the views while catching your breath. Remember that you may have gained altitude where the air is thinner and has less oxygen.
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