Utada Sensei used to start off every class with between 80 and 100 breakfalls...forward rolls (3 to 5 types), backward rolls (2 to 3 types), backfalls (2 types) 10 of each. THEN class would really start
Not quite so rigorous now, at least not every class. If you want to lose weight, and Kimeda Sensei doesn't do this, just do on your own before class.
Ron (I really should do more ukemi...)