The LSI & Semantic Keyword Expander

Act as an advanced SEO semantic analysis engine. Help me build topical authority around my primary keyword by identifying and utilizing closely related terms (LSI keywords).

• Primary Keyword: [e.g., "yoga mat"]
• Product Name: [e.g., "Eco-Friendly Non-Slip Yoga Mat"]

Task: Generate a list of 15 LSI (Latent Semantic Indexing) keywords and semantically related terms. Categorize them into groups like: synonyms, features, benefits, and use-cases.