We talk about merle a lot in this handout, so it seemed. like a good idea to explain what it is (and isnât). The. most important thing to remember is that merle is a. color pattern, not a color by itself. Merle dogs can. come in a variety of colors. The most.
Two years: Toddlers begin walking up and down stairs using a non-alternating stepping pattern with hand held or rail assistance. Three years: Children begin walking up the stairs using an alternating stepping pattern without the handrail and down stairs using a non-alternating stepping pattern. Four years: Children begin walk up and down the stairs using an alternating stepping pattern without support.
Stair Walking Movements. Your hips, knees and ankles must all engage when you walk up stairs. As a result, your leg and hip muscles help move your joints through a variety of motions, including hip flexion, knee extension and flexion, ankle dorsiflexion and plantar flexion. A 1967 British study noted that stair walking can be divided into 21 stages.