The ornamental design for a stability and strengthtrainingbase, as shown and described.
FIG. 1 shows a perspective view of a stability and strength training base.
FIG. 2 shows a front elevation view thereof;
FIG. 3 shows a left side elevation view thereof;
FIG. 4 shows a back view thereof;
FIG. 5 shows a right side elevation view thereof;
FIG. 6 shows a top plan view thereof;
FIG. 7 shows a bottom plan view thereof;
FIG. 8 shows a perspective view of the stability and strength training base of FIG. 1 in a condition of use; and,
FIG. 9 shows a top plan view of the stability and strength training base of FIG. 1 in an alternate condition of use.
The broken lines in FIGS. 1, 6, 8, and 9 illustrate the environmental structure of a stability and strength training base and form no part of the claimed design.