Tracking requires a great deal of walking in fields and woods. You may need to to walk up steep hills, hop over ditches, and climb over fences. To lay an advanced track and run it later may require you to walk well over a mile in rough terrain. In short, tracking entails hiking. Of course, it's great fun and will prolong your life.
Any dog can track.
Dogs have a sense of smell so keen we can't even conceptualize what it's like. Any breed of dog, and those of mixed heritage, can follow scent. My wife and I track with our two German Shepherd Dogs and our Belgian Tervuren . The only requirement is that a dog be in good health. A dog that doesn't feel good will not enjoy the exertion, and will be an unwilling training partner.