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			 The ornamental design for an ergonomical lawn chair, as shown and described
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FIG. 1 is a top plan view of an ergonomical lawn chair showing my new design;
FIG. 2 is a bottom plan view thereof;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is an inverted rear elevational view thereof; and,
FIG. 6 is a front elevational view.
The fragmented depiction of surface treatment in FIG. 1 is understood to be continuous throughout the implied areas.
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