Hot Yoga is virtually the same as Bikram with some minor differences. It is practiced in a heated studio, but it deviates from the strict Bikram sequence.Bikram consists of 26 specific asanas (poses) that are performed in a certain order in a studio set to 105°F. Hot Yoga is typically practiced with heat varying from 80-100°F, and does not have a fixed series of asanas, emphasizes the meditational aspect, and any style of yoga can be used.

Don’t forget to breathe properly. Let your body take the deep inhales and exhales that it needs. If it becomes too much, take a break. It takes time to progress so never compare yourself to the person next to you. Listen to your body, not your ego. Be prepared to sweat excessively, bring an extra towel or two, and plenty of water. It is extremely important to start hydrating 24 hours prior, avoid eating for 1-2 hours before class, and to wear form-fitting breathable clothing.

Hot Yoga is physically demanding and it is not advisable for beginning yoga practitioners. Those with cardiac issues, high blood pressure, or other medical conditions must be cautious. Hot Yoga can improve overall body strength, range of joint motion, and balance. If you are up to the challenge and are prepared, you will benefit greatly from this intense practice.

Ref: https://en.wikipedia.org/wiki/Hot_yoga