You should NEVER be tired

Simple Fact-You should NEVER be tired
When you exercise, you should be finishing each session feeling strong and full of energy – actually more than when you started. If you are struggling to finish a workout, you are not taking in enough calories and/or enough carbohydrates (dense breads, fruits and vegetables). Ironically, you burn fat more efficiently when your blood sugars are stable during exercise. If you feel sleepy or sluggish within 20-30 minutes of eating, you may have sensitivity to certain foods types or ingredients. The problem: not consuming enough calories negatively effects the quality of your exercise efforts and limits your ability to burn fat.

Source: Coach Robb
https://www.facebook.com/CoachRobbBeams?ref=hl