The ornamental design of a sporttrainingcart, as shown and described.
1.1 is a front perspective view.
1.2 is a rear perspective view.
1.3 is a front elevation view.
1.4 is a rear elevation view.
1.5 is a side elevation view.
1.6 is an opposite side elevation view.
1.7 is a bottom plan view.
1.8 is another rear perspective view, showing balls as accessories in broken lines.
The broken line showing of balls as accessories in Figure 1.8 is included for the purpose of illustrating use and environment and forms no part of the claimed design.