My muscles get tight if I don't eat roughly every 4-6 hours. (8am/12pm/6pm meals for instance). I stretch and walk every day. Maybe "peak productivity" isn't a

My muscles get tight if I don't eat roughly every 4-6 hours. (8am/12pm/6pm meals for instance). I stretch and walk every day. Maybe "peak productivity" isn't at a desk for hours where your primary energy expenditure is digestion, for most people