Providing Sitting Balance Training With a Newly Developed Rehabilitation Device

This clinical study is being conducted to evaluate a new training device, the T-CHAIR, for trunk rehabilitation and post-stroke balance. The investigators would like to study three objectives. First, the investigators want to examine whether training with a new training device is feasible and safe during rehabilitation in the later phase, more than six months after a stroke. The investigators also evaluate whether training with a new training device has an effect on the sitting balance and the function and strength of the trunk. Finally, the investigators examine whether training with a new training device has an effect on walking, standing and activities of daily life and self-care.