This was truly amazing, and the most difficult experience ever - your fitness level matters and being informed of what to expect is important. You will be challenged I think no matter your lifestyle/age...I would dress differently for the adventure now that I have lived it. I'd wear long sleeves, and long leggings as part of the bathing suit because you will be climbing, stretching, scrunching, slipping, and sliding like you've probably never done before except when you were a little kid. So being flexible is important and wearing footwear/like swimwear is really helpful/like even sneakers would have been my choice if I knew before, also, you will be in sock feet (I thought for 20 ft in the sacred area) NOPE, a long trek/climbing with wet/socks/rocks, etc. so I'd recommend thick good socks/or 2 pairs as the wet/rocks and climbing is a trip you'll remember forever. Our Guide was remarkable, and so instrumental in the entire experience, Patrick Warrior, made this the most amazing adventure the entire day....he was surefooted, really brilliant, filled with fabulous people skills, yet so chill, AND gave us all an experience to remember all our lives. I'm forever grateful to Patrick for making sure that I could complete the trip, I had doubts and his skill, knowledge and manner of handling a group was so impressive, he was in the know the entire time....I am so proud that we did the trip! It is difficult to describe what you will do -- 3/4 mile into the dark/cold water/very wet sometimes, super small/areas - finding ways to get up/over/through will challenge most everyone. So, make sure you are comfortable going beyond, don't mind getting wet/and like working and trusting other people you just met. If you have any health issues, physical challenges esp. legs/arms and strength...this is not for you - I'd say having a really strong fitness level will make this a mind blowing day. Be prepared!