Alexander Koryagin to Anton Shepelev:

AS>> -- When I was twenty I was lifting 200 kg!

AK> I doubt about the Present Continuous in the first
AK> sentence. You should point the exact time when you do
AK> it, IMHO. If you say about a one year period you should
AK> use the Simple Past. Besides, nobody said that he lifted
AK> the weight one time only. :)

You interpret Present Perfect as denoting an on-going
process, whereas I think it can also express a state, e.g.
the ability to lift a certain weight.

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