Somedays (like today) I feel literally like I could move mountains! Is there any harm to pushing yourself harder on these good days? Just likes it's okay to slow down on the low energy days (I'm talking about going from 5 sets to 7 to 8 sets).
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If you want to increase your overall time under load (which based on other posts of yours is a strong possibility), this would be a good time to increase the weight. That way, on your low energy days you'll already have built the base to keep the higher weights.
The arguments for and against the extra sets really depend on your goals:
Yes, but depending on your goals (i.e. strength gains versus endurance) it may make more sense to add extra weight.
Edit: If your goal is to burn a specific number of calories, increasing weight or reps won't provide any benefit. If the goal is increase strength, size, power, or endurance doing more work than normal will get you closer to overload where the micro trauma occurs that allows for muscle growth (assuming your diet and rest periods will accommodate the growth). The proper balance of weight versus reps depends on which type of muscle fibers (i.e. slow twitch, fast twitch A, or fast twitch B) you want to encourage.