[Soccermom]

AA,
Having lived aboard for a number of years I know your space will be limited,however there are a few things youcando.
Weights (canned vegetables,juices), therapy (resistance) bands and perhaps an audio tape of a mat pilates workout that can be done on the cabin sole. Between the three , raising lowering sails and just keeping your equilibrium on a moving vessel you should be able to stay fit,

Bon voyage!
Marcia