This class is doing some serious strengthening and toning for my body! In the short time I've been doing it, I see a big difference in my arms and abs. Natalie is one of the best fitness instructors I've ever taken. I honestly think I'm taking Bob Harper pre Biggest Loser...she is about to hit it big, so better take her classes while you can. She's motivating and inspirational. I'm so tired of seeing "fitness instructors" with no real fitness experience...but Natalie is the real deal...you literally KNOW that she's better than you at every move you're doing...but she's not cocky, she's supportive and just makes you want to work harder and do better. Only bad part is the location---which is a pain to get to...no matter where you live.