Two of the most popular weights used for vests are the 20- and 50-pound versions, though other weight limits also exist. The primary use of a weight vest is for resistance training, though losing weight is another effect. Resistance training is meant to build muscle. Mass, strength and power increases are usually seen as a consequence of resistance training. The benefits with a vest are increased because of the extra weight.
Did you mean Mt. Rainier? Mt. Rainier is 14,411 ft (4,392 m) in elevation, and 13,211 ft (4,027 m) in prominence.
If I had only one day to see Mount Rainier, I would start early in the morning and would drive to the Sunrise Visitor Area at 6,000 feet (2,000 m) elevation on the eastern slope. The early morning light offers the most photogenic views on this side of the mountain.