In practice matches before the 1983 World Cup, I struggled to get my line and length right in English conditions after playing for three months each in Pakistan and West Indies.
Kapil Dev. Pic/Sameer Markande
I bowled shorter than the required length in England.
As no support staff or videos were available, the best option was to bowl behind Kapil Dev during practice.
I keenly observed what he did to bowl accurately. I was able to adjust my release point and got into rhythm in time for the big World Cup matches.