Curling is a sport whereby you push a “rock” along a flat ice lane, with the goal of landing it as near the target as possible. Similar to lawn bowls.
Once the rock is released you can “sweep” the ice in front of it in order to change direction (curl), or speed it up.
If you choose the wrong line on your release it doesn’t matter how much sweeping you do.
Same for startups.
Choose the wrong business, and it doesn’t matter how hard you work. You’ll fail.
Be careful to choose the right line.
Then sweep like mad.