Then the interesting bit is the question of "how do I push it to that level every single day without pushing it as far as making myself ill". For me working ou

Then the interesting bit is the question of "how do I push it to that level every single day without pushing it as far as making myself ill". For me working out isn't that fun. But if I push myself too far over a few weeks - then I will become ill. And I would like to keep working out as close to the limit as possible. The problem becomes a low-frequency one - and it's not that easy to manage.