Watercraft for transportation and exercise

A watercraft for transportation and exercise comprising:

• a boat for floating on water and having a portion thereof above a waterline and a portion thereof below the waterline;
• an opening in the boat for permitting a person to be partially below the waterline and partially above the waterline;
• a sub-frame operatively attached to the boat, the sub-frame having a lower position and an upper position;
• and
• a propulsion device operatively attached to the sub-frame for propelling the watercraft forwardly in response to movement of the person's feet, the propulsion device having a foot contact portion, wherein:
• the foot contact portion of the propulsion device is disposable a predetermined distance from the waterline for use in a transportation mode so that a person can be at least partially above the waterline when using the propulsion device in the transportation mode, said foot contact portion of the propulsion device being disposable in the water a distance below said predetermined distance when the propulsion device is being used in an exercise mode wherein at such time the person's legs are at least partially disposed below the waterline.