A front support in gymnastics is usually done on the bars. You will be upright and on top of the bar with your arms perfectly straight and your belly off the bar. Your stomach should not be touching the bar. You should be supporting yourself all the way up with your arms. This is one of the fundamental positions of gymnastics which will lead to the development of other skills on the bar as well.
A fundamental niche is the theoretical role, place, or function that a species has within its ecosystem, such as trophic position, life history, habitat, and geographical range. This niche can be filled or not by the species, but it is assigned to it. Realized niche is the role that the species fills in reality, and is often narrower than the fundamental niche.