List of metropolitan areas by population. One concept which measures the world's largest cities is that of the metropolitan area, which is based on the concept of a labor market area and is typically defined as an employment core (an area with a high density of available jobs) and the surrounding areas that have strong commuting ties to the core.
Average Costs. In treatment year 1, the average costs per patient diagnosed with PTSD ($8,300), TBI ($11,700), or both ($13,800) were much higher than the average costs for those with neither PTSD nor TBI ($2,400) (see Table 2 and Figure 3 on page 20).
I'm not sure what rates for a personal trainer are where you are, I'm guessing the USA! But here PTs cost anything from Â£15-Â£200 per hour. The offer you mention may be a good deal, but it really depends on the level of knowledge the trainer had and what you are hoping to achieve. Half an hour is not very long for a session.