Medical Definition of ISOMETRIC. 1. : of, relating to, or characterized by equality of measure; especially: relating to or being a crystallographic system characterized by three equal axes at right angles. 2.
ALSO READ: Diet for Abs: Foods for Six Packs Abs. Muscle Building: Worst Foods for Abs #2. Commercial peanut butter: Peanut butter is one of the best foods you can consume if you want to build muscle, due to its high protein content. Peanut butter is also a great post workout snack.
Salmon is potentially a better muscle-building protein than a low-fat fish, such as tuna or cod, because it's higher in calories. These extra calories are ideal if you're active and looking to build muscle, notes dietitian Karen Ansel. You also get healthy omega-3 fats, calcium and vitamin D.