"We learnt from the English bowling on day one and we saw that they bowled too short at times. So we watched and learnt what lengths to bowl and adjusted out bowling accordingly," Kumar said after the second day's play yesterday.
Kumar took 4-46 in the hosts' first innings as they reached 219/6 at stumps on day two in reply to India's 295 all out.
"I am enjoying bowling in England. It is definitely a good feeling to do well at Lord's," Kumar said about his incisive spells.
Talking about a disciplined bowling performance, he added, "The plan is to bowl outside the off-stump. There has been assistance from the wicket in this Test but even then it is important to stay disciplined.
The Indian bowling didn't allow the English batsmen to settle down at any stage during the day's play and at one stage they were reduced to 113/4 before Gary Ballance's second Test century -- and a second one at Lord's in two matches here - saved the day for them.