Do you feel fine before your workout, but really tired after the workout? There are a few elements that could be at play here, including:

• Dehydration Fatigue is one of the most common symptoms of dehydration, and exercising increases the water we lose through sweating and breathing. How to fix it: Make sure you drink plenty of water before, during, and after exercising (as well as regularly throughout the day). We have sports and electrolyte options at the desk.

• Low blood sugar Exercise uses up the glucose in our blood, and the glucose stored in our muscles (known as glycogen). If you’re exercising at a moderate to high intensity, you can actually use up all of the body’s reserved glucose, which causes low blood sugar. How to fix it: Make sure you are properly fuelling up before your workout by eating a meal or snack that has plenty of carbs, and eat some carbohydrates shortly after your workout to replenish your glycogen stores.
• Training intensity Are you a big fan of HIIT, or other high intensity training styles? High intensity exercise uses anaerobic energy pathways to produce energy. While this is great for producing short bursts of power and intensity, it creates an oxygen deficit and produces lactic acid, both which the body has to restore after exercise. This in itself consumes energy, and also means there’s less oxygen (as well as glycogen), which can also impact energy levels. How to fix it: Keep HIIT sessions short, and cut back on how many you do. Although it can be tempting to do every workout as HIIT, you should only be doing 1-2 a week.

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