For example, assume 1 ETH is trading at $2,000, and you believe ETH price will go up. You can take a long position with deposit 1 ETH and 4X boost. BiFi X adds 3 ETH in flash loan to deposit, borrow 6,000 USDT, swap USDT for 3 ETH on Uniswap to repay the flash loan. You have 4 ETH in deposits and 6,000 USDT in borrows.