The only forms of normal walking are forward and backward. Walking backwards can sometimes be useful because it evens out the stress on your body. For that reason, for example, it's a good idea to walk the last one or two hundred yards of your walk backwards. Walking may also be categorized by pace. "Brisk" walking is walking at a pace of 4 mph (or more). Race walking, as in the Olympic games, is not normal walking; it looks odd compared to normal walking and it's done at a very brisk pace in competition.
Of course it does. If walking builds muscle then walking at an incline builds muscle. Different muscles will be worked at different angles.
walking bike trucks
Running is a faster locomotion than walking.
Alleles are different forms for a trait
different forms of electromagnet
Isotopes
Isotopes
Isotopes.
Isotopes
A characteristic is a feature that has different forms in a population
Isotopes.
Isotopes