The ornamental design for an adjustablefitnesskettlebell handle, as shown.
FIG. 1 is a front perspective view of the adjustable fitness kettlebell handle;
FIG. 2 is a front elevation view of the adjustable fitness kettlebell handle;
FIG. 3 is a rear elevation view of the adjustable fitness kettlebell handle;
FIG. 4 is a right side view of the adjustable fitness kettlebell handle;
FIG. 5 is a left side view of the adjustable fitness kettlebell handle;
FIG. 6 is a top view of the adjustable fitness kettlebell handle;
FIG. 7 is a bottom view of the adjustable fitness kettlebell handle; and,
FIG. 8 is a bottom perspective view of the adjustable fitness kettlebell handle.
The broken line showing of details in FIGS. 1-8 is included for the purpose of showing environmental portions of the design. No claim is made to the portions shown in broken line.