This is a question i ask myself too.
Choosing your camera gear is essential when it comes to creating virtual walks.
Of course you want to create the best quality, but with great quality comes great weights.
Carrying such a weight for a long time can be a nuisance to the body.
On days when i feel physically unsuitable for heavy equipment i will use a mobile camera, the quality is quite close to that of a dedicated camera these days.
With a weight difference of about 2 KG, it can be a relief to work with a mobile.
On days when i use my main camera, i usually walk for about 20 to 30 minutes in one take in a given location, after which i rest my back and arms.
Going to the gym every week to regain your strength is recommended if you ever want to become a cameraman/woman.