winter season

I exercise.

私は運動します

I exercise in the cold winter season.

私は寒い冬季に、運動します

I exercise with my friend in the cold winter season.

私は寒い冬季に、友達と運動します

I exercise with my friend early every morning in the cold winter season.

私は寒い冬季に、友達と毎朝早く運動します

I exercise with my friend at the gym early every morning in the cold winter season.

私は寒い冬季に、友達と毎朝早く体育館で運動します