By investing in the entire market continuously, and squeezing every spare penny to invest even more when there's blood on the streets.

You don't have to time anything right or pick any winners with this strategy, because you'll invest all the way down and all the way back up. You might not have made money from Jan 1 2008 through Dec 31 2008, but that money would have made a killing subsequently.

Of course if you were out of work in 2008 that is easier said than done.

OTOH If you try to make a killing by shorting, there's an infinite number of ways to end up broke by getting the timing wrong. If you bet everything on picking bottom, you can miss the boat or miss the bottom. Not nearly as risky as shorting, but certainly not as reliable as staying the course.

I never invested in direct stocks until 2008. Markets were going up just before the crash and a investing friend suggested why not buy stocks. But my demat account got delayed and when i received it markets were going down hard. I ended up investing very small amount. But i got nearly 4 times the return(I did wait few years)

Timing is very difficult, I've been told over and over again. I personally think it's easier to time the top rather than the bottom. The reason: the fall is always preceded by lots and lots of people forecasting doom and gloom. I got out of Sun Microsystems stock (and some others) at the end of 1999 for that reason. Sold at $150+. Months later it was at $5. Now, I'm no prognosticator. I was looking to buy a house in the future and knew I needed to convert to cash at some point. So, I was sort of hyper aware of what was going on and at the end of 1999 I just couldn't take it anymore.

I'd love to hear how people timed the upswing from 2008.

Yes.