What size mat do I need for a home gym?

Standard yoga mats (24" x 68") work for yoga and stretching. For HIIT, floor exercises, or any workout where you move laterally or need extra length for lying down, a large exercise mat (24 36" x 72 84") is significantly better. If you are over 6 feet tall, look for 84" length mats. For dedicated home gym spaces, large format mats or interlocking floor tiles (4'x6' or larger) protect both you and your flooring.