This article originally appeared on People.com.

Serena Williams is paying tribute to her mom’s strength as she embraces the first days of her new life as a parent.

The athlete – who delivered daughter Alexis Olympia on Sept. 1 – shared a personal, heartfelt letter to her mother, Oracene Price, to Reddit on Tuesday.

In the note, Williams told Price, “You are one of the strongest women I know.”

“I was looking at my daughter (OMG, yes, I have a daughter) and she has my arms and legs,” said Williams, 35. “My exact same strong, muscular, powerful, sensational arms and body. I don’t know how I would react if she has to go through what I’ve gone through since I was a 15 year old and even to this day.”

Williams continued, noting several examples of sexism and body shaming she’s faced for much of her life.

“I’ve been called man because I appeared outwardly strong,” said the tennis champion. “It has been said that I use drugs (No, I have always had far too much integrity to behave dishonestly in order to gain an advantage.) It has been said I don’t belong in Women’s sports — that I belong in Men’s — because I look stronger than many other women do. (No, I just work hard and I was born with this badass body and proud of it.)”

Wrote Williams, “But mom, I’m not sure how you did not go off on every single reporter, person, announcer and quite frankly, hater, who was too ignorant to understand the power of a black woman.”

View this post on Instagram

Dear Mom, You are one of the strongest women I know. I was looking at my daughter (OMG, yes, I have a daughter 😳) and she has my arms and legs! My exact same strong, muscular, powerful, sensational arms and body. I don't know how I would react if she has to go through what I've gone through since I was a 15 year old and even to this day….

A post shared by Serena Williams (@serenawilliams) on Sep 19, 2017 at 11:20am PDT

View this post on Instagram

Dear Mom, You are one of the strongest women I know. I was looking at my daughter (OMG, yes, I have a daughter 😳) and she has my arms and legs! My exact same strong, muscular, powerful, sensational arms and body. I don't know how I would react if she has to go through what I've gone through since I was a 15 year old and even to this day….

A post shared by Serena Williams (@serenawilliams) on Sep 19, 2017 at 11:20am PDT

View this post on Instagram

Dear Mom, You are one of the strongest women I know. I was looking at my daughter (OMG, yes, I have a daughter 😳) and she has my arms and legs! My exact same strong, muscular, powerful, sensational arms and body. I don't know how I would react if she has to go through what I've gone through since I was a 15 year old and even to this day….

A post shared by Serena Williams (@serenawilliams) on Sep 19, 2017 at 11:20am PDT

View this post on Instagram

Dear Mom, You are one of the strongest women I know. I was looking at my daughter (OMG, yes, I have a daughter 😳) and she has my arms and legs! My exact same strong, muscular, powerful, sensational arms and body. I don't know how I would react if she has to go through what I've gone through since I was a 15 year old and even to this day….

A post shared by Serena Williams (@serenawilliams) on Sep 19, 2017 at 11:20am PDT

View this post on Instagram

Dear Mom, You are one of the strongest women I know. I was looking at my daughter (OMG, yes, I have a daughter 😳) and she has my arms and legs! My exact same strong, muscular, powerful, sensational arms and body. I don't know how I would react if she has to go through what I've gone through since I was a 15 year old and even to this day….

A post shared by Serena Williams (@serenawilliams) on Sep 19, 2017 at 11:20am PDT

View this post on Instagram

Dear Mom, You are one of the strongest women I know. I was looking at my daughter (OMG, yes, I have a daughter 😳) and she has my arms and legs! My exact same strong, muscular, powerful, sensational arms and body. I don't know how I would react if she has to go through what I've gone through since I was a 15 year old and even to this day….

A post shared by Serena Williams (@serenawilliams) on Sep 19, 2017 at 11:20am PDT

View this post on Instagram

Dear Mom, You are one of the strongest women I know. I was looking at my daughter (OMG, yes, I have a daughter 😳) and she has my arms and legs! My exact same strong, muscular, powerful, sensational arms and body. I don't know how I would react if she has to go through what I've gone through since I was a 15 year old and even to this day….

A post shared by Serena Williams (@serenawilliams) on Sep 19, 2017 at 11:20am PDT

View this post on Instagram View this post on Instagram

Dear Mom, You are one of the strongest women I know. I was looking at my daughter (OMG, yes, I have a daughter 😳) and she has my arms and legs! My exact same strong, muscular, powerful, sensational arms and body. I don't know how I would react if she has to go through what I've gone through since I was a 15 year old and even to this day….

A post shared by Serena Williams (@serenawilliams) on Sep 19, 2017 at 11:20am PDT

The star told Price that she is “proud” that, together, they “were able to show them what some women look like.”

“We don’t all look the same,” she said. “We are curvy, strong, muscular, tall, small, just to name a few, and all the same: we are women and proud!”

Williams said that she hoped to be as “classy” as her mother, noting that she is “trying.” Wrote Williams, “I have a LONG way to go, but thank you.”

“Thank you for being the role model I needed to endure all the hardships that I now regard as a challenges — ones that I enjoy. I hope to teach my baby Alexis Olympia the same, and have the same fortitude you have had,” wrote Williams, concluding, “Promise me, Mom, that you will continue to help. I’m not sure if I am as meek and strong as you are yet. I hope to get there one day. I love you dearly.”

It's very weird for me to believe I have a child… a KID. I'm a mom. A real MOM ❤️❤️❤️

— Serena Williams (@serenawilliams) September 18, 2017

RELATED: Alexis Ohanian Talks ‘Dad Life’ with New Snap of His and Serena Williams’ Daughter: ‘She Is My Legacy’

Williams and fiancé Alexis Ohanian introduced their daughter to the world last week with a montage of photo and video moments from their pregnancy, revealing that the dealt with “complications” during the delivery, adding, “But look who we got — we got a baby girl!”