What are the key factors to consider when adjusting the saddle of a bike for optimal comfort and performance?

When adjusting the saddle of a bike for optimal comfort and performance, key factors to consider include the height, angle, and fore-aft position of the saddle. The height should be set so that your leg is almost fully extended at the bottom of the pedal stroke. The angle should be level or slightly tilted downwards. The fore-aft position should be adjusted so that your knee is directly over the pedal spindle when the pedals are at the 3 and 9 o'clock positions. These adjustments can help prevent discomfort and improve efficiency while riding.