Place the pasta, zucchini, garlic, olive oil, salt, red pepper flakes, and water into a large straight-sided skillet.
Bring the liquid to a boil over high heat.
Cook the mixture, tossing constantly with tongs to ensure pasta does not stick, for approximately 5 to 6 minutes or until the pasta is al dente and the liquid has reduced to a thin sauce.
Add the fresh baby spinach and grated Parmesan cheese to the skillet.
Toss for 1 minute until the spinach is wilted and the cheese is incorporated.
Season with black pepper and serve immediately.