Re: Tips to increase energy and endurance?
Robin provides good feedback regarding rest breaks, too. Rowing training sessions usually last 90 - 120 minutes and are followed by food and rest (I didn't say that, but how much detail do you want).
As Mary has said, you're still in the "adapt to the amount of work" phase. Her point about "food" being cheap and convenient is so true - most of our palate has been conditioned by the fast "food" industry to crave sugar, fat, and salt, but with a good balance of spices and other non-sweet, non-fatty, non-salt condiments, you can have a very tasty meal of what some consider bland (beans and rice, boiled potatoes, steamed veggies - you do NOT need cheese sauce on broccoli or cauliflower - just don't cook them til they're mushy - leave em a little crunchy and they still taste good (and on, and on, and on)
Be patient. School's first (hold up two fingers) Aikido is second (hold up one finger)…. All of it requires fuel.