There are very few joys in life greater than spontaneity. Spontaneity means to be in the moment; it means acting out of your awareness, not acting according to your old conditionings.
Of course we all have our limits, but how can you possibly find your boundaries unless you explore as far and as wide as you possibly can? I would rather fail in an attempt at something new and uncharted than safely succeed in a repeat of something I have done.