The baby was born on the bathroom floor of her home in Gloucestershire, south-west England, at around 6.20pm, “after she arrived very quickly”.
“She was running to the gym, getting a mat, swimming into the bathroom, mat on the floor, towel down, brace, brace, brace.” Tyndale said.
The baby, named Lucas Philippe, weighed 8kg at birth, a spokesman for the couple told CNN.
Mike Tyndale said the couple’s other two children, Mia Grace and Lena Elizabeth, were not home on Sunday for the new arrival, but have since seen them and are “on the moon,” Mike Tyndale said.
The midwife, whom they were to meet at the hospital, was quickly on the scene because she was not too far away, and another “came up with a head injury,” he added.
A Buckingham Palace spokeswoman told CNN that Queen Elizabeth and her husband, Duke Ed F. Edinburgh, “enjoy the news” and “hope to make a new addition to the family when circumstances allow.”
Zinda looks healthy, Tindal said and he is going for a walk with the baby.
“She was a warrior, as always, they always are,” Tyndale said. “We can never do justice to what a woman has to go through during childbirth.”
He said there are benefits to giving birth at home. After Lucas’ arrival, Tyndale watched an old rugby game and some golf with his new son.
Zara Tyndale is a skilled equestrian who won a silver medal in the team event at the 2012 London Olympics.
She met her husband when she was playing for England during the 2003 Rugby World Cup. The couple married in 2011 in Edinburgh.
Amy Cassidy of CNN contributed to this report.
.