This is a power based cycling plan that is progressive in nature and all power based. To achieve the adaptation I would expect at the end of this program, you will have had to achieved all the key power based sessions that in the working week. Sessions that are over the weekend, are not going to add significant strength and or power to your fitness. This latter part of the week is endurance, but as recent research suggests you do not need huge amounts of this in order to have sufficient endurance to race. Riders rarely lose a race due to endurance, but often they do due to lack of speed, power or strength.... Quality Vs Volume and quality is key.... `So don't skip this and if needed skip the endurance ride at the weekend, especially if the weather is indicating its risky to ride.