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Often, people who are looking for the best weight loss program are also seeking easy weight loss. There's nothing wrong with that. Between work, family and other obligations most Americans are simply too busy for a diet and exercise program that doesn't produce fast results.

For those seeking to achieve a healthy weight quickly, hydraulic fitness equipment may be the best answer. This is true because most circuit training equipment is double-concentric.

There are two movements in any resistance training (weight lifting) exercise. These are called the concentric and the eccentric parts of the exercise, also commonly referred to as the 'positive' and 'negative'.

The concentric (positive) part of the resistance training movement is defined as "Muscle action in which the muscle is shortening under its own power" (source: International Sports Sciences Association; 2001). Examples would be pushing the bar away from you on a bench press, or lifting the bar towards your chin on a biceps curl.

The eccentric (negative) part of the resistance training movement is defined as "Muscle action in which the muscle resists while it is forced to lengthen" (source: International Sports Sciences Association; 2001). Examples would be lowering the bar on a bench press, or lowering the bar away from your chin on a biceps curl.

The majority of hydraulic circuit training equipment does not have an eccentric movement. Instead, it is double-concentric. Each piece of equipment works opposing muscle groups. In other words, there literally is no need for an eccentric movement.