Isometric resistance Isometric exercise

plank

resistance in isometric exercises typically involves contractions of muscle using:

the body s own structure , ground
structural items (e.g., pushing against fence)
free weights, weight machines, or elastic equipment (e.g., holding weight in fixed position)
pressure-plate-type equipment has digital display of maximal force.

depending on goal of exercise, exertion can maximal or sub-maximal.