A training device that is easily and temporarily attachable to any existing sled training device. The training device includes a flexible, elongated plank that resides between an athlete's legs and helps train the athlete to maintain a proper stance width while blocking or pushing a sled. An embodiment includes a magnet secured to the plank at a first end of the plank. The magnet engages the sled and is detached from the sled when the athlete pushes the sled with an improperly narrow stance width. As a result, the athlete experiences a tactile and visual aid to distinguish between proper and improper stance width while pushing a sled.
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