Morning or evening workout: which suits a commuter?
For building strength and changing body composition, the time of day matters much less than whether the session happens. Train in the morning or the evening and the result depends mostly on the total work you do and what you eat. So the real question for a commuter is which session is more likely to survive the week.
That is usually the morning. A 06:30 session at UNTIL Liverpool Street is finished before the day can interfere. An evening session has to start by about 18:30 to be worth doing before the 20:00 close, and it competes with late meetings, delays and the pull of the train home. The block therefore puts the heavier session in the morning and gives the evening one the work that can absorb being missed.