Eggs, which are rich in protein and vitamins, are cheap and absolutely necessary for fitness lovers, but boiled eggs are not necessarily delicious. You can add some seasonings such as soy sauce and sauce.
Beef, the price of beef is a bit high, but it is a very good muscle-building food. Not to mention that lean beef contains a lot of protein, another thing that fitness enthusiasts like in beef is creatine, which can enhance the level of muscle movement, and the content in beef is also considerable. And beef is delicious no matter how it is cooked. The biggest problem is that meat is really expensive.
Salmon, that's quite expensive. I think it's expensive for a seaside person, but it may be more expensive inland. But fitness people like to eat, after all, there are many protein, delicious meat, and rich fish oil to ensure their fat intake. Anyway, it's not bad to buy a few hundred grams every once in a while if you have spare money.
Besides protein, let's talk about carbohydrates and fats. Oats are tasteless to most people, but corn flakes perfectly solve this problem, with high carbohydrate content and sweet taste. But corn flakes lack dietary fiber. It's your choice. Fat is also a necessity for fitness enthusiasts, but the amount is small. Basically, a handful of nuts is enough for one day. I prefer pine nuts and macadamia nuts. They are delicious and hungry.