How long are the classes and how physical are they? Classes generally range from 30-60 minutes - more strenuous walks and hikes tend to be a little longer and may be up to 90 minutes. We strongly recommend that you text "SERVICE" to (831) 498-1944 to receive updates on class schedules and locations. Most classes cater to all levels of physical fitness, and you are encouraged to participate only to the comforts of your limits and capabilities - you can leave a class at any time you feel you have reached your exertion limit. Please note that all nature hikes do require maneuvering up and down hilly terrain at steep levels at certain points along the trails. How long are the classes and how physical are they?