Khloe Kardashian 35-lb weight loss & workout video: reality star back in training with Gunnar Peterson after Lamar Odom's hospitalization

Khloe Kardashian has a lot on her plate lately, with her husband Lamar Odom's recovery from his almost fatal drug use and Kardashian's memoir to be released tomorrow. Despite her busy schedule, the 31-year-old reality TV star still makes it a point to regularly hit the gym and work on her body, which has lost an impressive 35 lbs, Celebrity Health Fitness reports.

Kardashian, who poses nude on the cover of her memoir, recently published a video of herself working with celebrity trainer Gunnar Peterson at the gym. Watch the video below to find out how high-intensity interval training (HIIT) helped accelerate her weight loss. Gunnar also explains that short bursts of high intensity work helps torch more calories.

According to Kardashian, "I work out to look a certain way and feel a certain way but I do it for myself. I did it on MY terms. It’s for my self esteem and I feel so confident and proud of my achievements right now."

The reality TV star and businesswoman added, "It’s for all my critics who called me ‘the fat one’ for my entire existence."

Meanwhile, Kardashian also graces the cover of the latest issue of People magazine, where she talked about her body images issues and her relationship with Odom.

"Growing up, I was always chubby," Kardashian explained to People. "My girlfriends were always running around in two-pieces and I never felt comfortable to do that."

However, she admits that she felt good being different than her older sisters, saying, "I knew I didn't look like my sisters and I didn't have those shapes, but I didn't think that was wrong. I had parents who were incredibly loving and nurturing and always made me feel beautiful so I never really questioned that."

Kardashian also opened up about the status of her relationship with Odom, saying that as soon as she heard of his condition, "All I knew was I had to get there. I had to get to him and make sure he was okay. I hate that he was in that situation. I wouldn't want anybody in that situation, especially someone I love and care about."

Despite retracting their petition for divorce, however, it seems that Kardashian isn't ready to jump back into her marriage with Odom. She admitted to the magazine, "There are too many other important things, too many medical things. It's not even in our brains thinking about us as a couple or having a relationship right now."

Kardashian said, "I loved him always, and I will always love him. I don't believe love is fickle. I believe when you love someone, you are allowed to love from afar. You don't have to be with that person in order to love him."

Read more about Kardashian's weight loss journey and relationship advice in Strong Looks Better, which hits bookstores tomorrow.