Generally, Spartans are huge people. The tallest one ever recorded was 239cm (about seven-eight). He was an anomaly and most of the Spartans are about 214cm (around seven feet). They reach maturity around the age of fourteen and are usually sent to a Tulathian academy specifically to train Tulathian Spartans. Tulathian Spartans are trained in all manner of combat from knife to energy weapons and a quarter are killed in the training. The Third Spartan Elite Guard number only twenty and are equipped with all manner of artifact weapons and armor. They are the terrors of any battlefield and when they are called to a battlefield, it always ends very badly for the opposing force. Even the eladrin are very wary of Spartans on the battlefield.
In order to maintain their numbers, the Tulathians with Spartan blood have been given special orders to only mate with other Spartans. In fact, childbirth is a serious business and Tulath is equal to or exceeds the medical knowledge of Danaan. Female Spartans that show up on the field are rare and are those that do so can no longer bear children or they have already borne a child. A female Spartan are still trained if they so desire, so a Spartan is still formidable regardless of gender. Spartans usually die young due to their profession that most likely take.
They are those that do not claim Spartan blood by have some of it in their genetic makeup. Indeed, all of the Tulathians born on Eave are the product of eugenic engineering and some who even have a Spartan way back when. Children born in Tulath with birth defects of any kind are euthanized. (I know it is hard to say, but those are the facts of eugenics).
[Please leave a comment if you may. This is the first time I am making extras and I would like to have some constructive criticism. Note that the Spartans are meant to be kings of the battlefield.]