The ornamental design for a fitness apparatus, as shown.
1. Fitness apparatus
1.1 : Perspective
1.2 : Front
1.3 : Rear
1.4 : Side
1.5 : Side
The design concerns a universal fitness device for the exertion of different fitness exercises; the device comprises two front legs and two rear legs which are connected together in their upper region by connecting joints and a connecting horizontal bar; the device comprises furthermore two fixing brackets, each fixing a front leg with a rear leg into a stable position of the device; the rear legs are connected by a reinforcing board; it is possible to insert additional bars into boreholes arranged in the front legs in parallel manner.