Another late reply! You might have felt lethargic for a few reasons. Low blood sugar. Too low of a calorie intake. Low iron. Dehydration. Stress, lack of sleep. I know that if I haven't eaten in over 16hours and try to workout, I'm not going to perform my best. Try a banana before a workout. Up your water intake. If none of these work, try getting your blood pressure taken before your workout and/or blood sugar.  I'm an EMT, so I already have supplies and it might be hard for you to obtain. But if you do, it's nice to be able to know that it is/or is not a blood pressure or sugar issue.  Second answer: Stirfry tastes bland when it becomes overcooked and the veggies start to release water. Try cooking veggies in a certain order because some cook faster than others. Try using a higher heat and bigger pan. If the pan is crowded, then the veggies will just simmer instead of stirfry. Once you have the order of the veggies figured out, add them in at the appropriate times, then at the very end, add your desired sauce or seasoning for 30 seconds just to warm it up. :)