So I am utterly sick of feeling like a weakling. I am a 5'4 female, at 110. I feel weaker than I did 3 years ago. I went hiking with my friends recently, and it wasnt a particularly difficult mountain, TONS of people hike there for exercise. And none of my friends are particularly fit, but I almost died walking up. I was so out of breathe I thought I was going to pass out or vomit. So I want to start a routine to build up some lean muscle and tone so I have more energy. I know I want to work on my arms and my abs. What is the best way to go about this? Cardio, strength training?