Should your shower be hot or cold?

There is a lot of talk about showering - and the benefits of it being hot or cold.

My local gym has one shower head that is cold - I admit that I prefer the hot ones though.

Bur which is better - or do they both have their uses:  This comes from a website, but I am not too sure about a couple of the claims - in particular the cold.

A Hot Shower

Relaxes the muscles

Lowers Body tension

Can help alleviate migraines

Reduces swelling

Reduces anxiety - through relaxation

Acts as a nasal decongestant

Removes toxins from the skin

Opens pores while cleaning

Good to do at night

A Cold Shower

Stimulates the immune system

Increases alertness (well it would certainly wake me up)

Can help prevent colds (I thought a cold was down to germs)

Anti-depression hormones

Accelerates metabolism

Frees up the mind

Tightens the skin

Reduce hair loss (this is a strange one)

Good to do in the morning

I guess in the end it all comes down to personal taste. In the James Bond books he often will have a cold shower, mixed with a hot shower, as it keeps him alert. Who knows??