I spend almost all my free time during the day doing a lot of exercises at home.

I don't like to come go to noisy and crowded places. In my free day time, I prefer staying at home to train myself rather than going out. I love doing a lot of physical activities, such as dancing, jumping, stretching... so I spend almost all day on training my body. Sweating during a workout makes me feel better and also helps me to release stress.

Alternatively, if this is a whole day that you don't have to attend work or school, you could say "day off" instead of "free time during the day"

I spend almost all my free days doing a lot of exercises at home .

I don't like to come go to noisy and crowded places. In my free days, I prefer staying at home to training myself rather than going out. I love doing a lot of physical activities, such as dancing, jumping, stretching... so I spend almost all the day on training my body. Sweating during a workout makes me feel better and also helps me to release the stress.

I suppose that thats your day off. Like weekends or sth?