I've often heard an alternative suggested to the quite frankly disgusting and dated terms, "Man Up" and "Grow Up". That alternative being, "Stand up and be counted". While their intentions seem sincere, I don't think they realise just how hurtful "Stand up and be counted" can be to a lot of people. There are many people who cannot stand up, 1.9% of the UK population use wheelchairs, and many people are innumerate.
There is a discussion here to be had on how our language is affecting people, and what we can do to be more compassionate to our fellow people whom we share this planet with. Of course, those who would rather hold back progress will always shout the loudest, as demonstrated so far in this thread.