An exercise apparatus that can be attached to any wheeled device that is pushed in which the wheel of the wheeled device is subjected to rolling resistance so that the person pushing it had to push harder thereby experiencing exercise. The spool pocket is proximate a pathway having a first and second opening through which the waste bags may be individually pulled and removed from the spool for utilization as a package for solid animal waste. The method further includes, responsive to determining that the electronic device is VoIP-enabled, sending data to the electronic device for establishing connection to the conference call over VoIP communications; otherwise, sending data to the electronic device for establishing connection to the conference call over one of a public land mobile network or a public switched telephone network. When such decoding file is not detected, internal memory stores data indicating the undetected decoding file. Memory usage is adaptively increased during decoding, subject to theoretical limits in the second settings.