Building lean muscle is significantly influenced by training age, with beginners having the potential to gain up to 20 pounds in their first year. However, many fail to maximize their gains due to improper training, nutrition, and sleep. Seeking guidance from a knowledgeable coach can help individuals navigate their fitness journey more effectively, avoiding the pitfalls of misinformation often found online. Investing in expert support can lead to better results and a more sustainable approach to fitness.