What is one of the main benefits to strength training? what are three safety guidelines to follow during strength training?

Benefits for strength training include;

Being able to lift heavy objects

Burning calories=losing weight

Building strong lean muscle. The more lean muscle you have the more energy you need to use the more calories you burn. The more calories you burn the more weight you lose. Strength training can be very beneficial however it can be dangerous when not careful. If you're new to strength training make sure to work with an experienced partner ( physical trainer) use weightlifting belts, make sure to have proper form and always have a spotter.

Ican only answer your first question, a machine is like a human body because it's a little similar. they both almost work like the same.