Make your practice area comfortable
Is your seat comfortable? Is the room well ventilated? Is there proper lighting? Make sure that your practice area is comfortable and free from distractions so you can concentrate. Also, consider adjusting your practice schedule depending on the time of year.
For example, during summer when the temperature is hotter, you can schedule your practice in the mornings when it's cooler. During winter and if possible, set your practice time in the afternoons when it's warmer.
(Resource from the web)