Here is a good study that says big exercises can increase testosterone levels, these ones: bench press, leg press, seated row, and squats.

J Strength Cond Res. 2008 Mar;22(2):426-32. doi: 10.1519/JSC.0b013e3181635843.
Salivary testosterone and cortisol responses in professional rugby players after four resistance exercise protocols.
Beaven CM1, Gill ND, Cook CJ.
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Abstract
............Each protocol consisted of four exercises: bench press, leg press, seated row, and squats. Pooled T data did not change as a result of RE, whereas C declined significantly. Individual athletes differed in their T response to each of the protocols, a difference that was masked when examining the pooled group data. When individual data were retrospectively tabulated according to the protocol in which each athlete showed the highest T response, a significant protocol-dependent T increase for all individuals was revealed. Therefore, RE induced significant individual, protocol-dependent hormonal changes lasting up to 30 minutes after exercise. These individual responses may have important ramifications for modulating adaptation to RE and could explain the variability often observed in studies of hormonal response to RE.