Depth and speed change the task
Deeper immersion generally changes how much weight is supported. Moving a limb faster through water can increase resistance. Body position, equipment, and water movement also matter.
A familiar movement may therefore feel easier in one respect and harder in another.
What is the goal outside the pool?
Water-based activity can offer a useful way to exercise or enjoy movement. If the goal is a specific land task, such as climbing stairs, some task-specific land practice may still be relevant. Buoyancy and water resistance do not reproduce all of the loading and balance demands of that task.
Access includes getting in and out
Pool entry, changing facilities, surface traction, temperature, supervision, and transportation can determine whether the option is workable. A class described as accessible may still involve an entry method that does not fit a particular person.
Ask about the actual setup before assuming that water automatically makes every exercise safe or comfortable. Swimming ability and medical considerations may affect participation too.
The best comparison is practical: what activity can you perform comfortably, with suitable support, and for a purpose you value? A pool can expand the options without needing to be presented as universally superior to movement on land.
