For me, it is partially a mental challenge. It's also a question of pace. You have to slow down so that you aren't over-exerting yourself (you know, when you cant catch your breath and you feel light-headed?).
It took me a while to stop letting myself walk, and to figure out a pace that would work. Now I power up hills (and kind of like them!) It takes persistence and practice. Just keep at it, be tough on yourself (a little bit.)
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