Ergonomic chair

The ornamental design for an ergonomic chair, as shown and described.

FIG. 1 is a front perspective view of an ergonomic chair, showing my design.

FIG. 2 is a front elevation view thereof.

FIG. 3 is a rear elevation view thereof.

FIG. 4 is a left side elevation view thereof.

FIG. 5 is a right side elevation view thereof.

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines illustrate portions of the ergonomic chair that form no part of the claimed design.

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