Cyclohexane chair flip (ring inversion) reaction. Structures of the significant conformations (A, B, C &amp; D) of the reaction are shown &amp; plotted against their energy differences (not total energies). Inversion happens quickly &amp; constantly in room temperature.
Conformations:
A: chair
B: twist-boat
C: boat
D: half-chair
Valleys of the pink graph are conformations lowest in energy (shown as A &amp; B). Peaks are conformations highest in energy (shown as C &amp; D). Energies are A&lt;B&lt;C&lt;D with D highest &amp; A lowest in energy. A is thus the most stable conformation &amp;, of all the other conformations, occurs most often in room temperature.
Valleys A &amp; B are local energy minima &amp; A is global minima. A &amp; B can thus be classified as conformers. Peaks are not conformers. Energy differences are mostly caused by anglular strain.
Source for conformer classification:

Pure &amp; Appl. Chem., Vol. 68, No. 12, pp. 2193-2222, 1996Source for the relative energy differences &amp; other info in this description:

J Clayden, N Greeves, SG Warren (2001). Organic chemistry. (2nd ed.). p. 373. ISBN 9780191666216.
Own work
Keministi