Single-leg was definitely challenging enough for me. Just be careful to use strict form - your free leg will want to "kick" up to add momentum.
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Subliminal MOTD: "If you insist on using a thumbless grip on the bench, you need to do it at home, so that when the ambulance comes (if anyone is there to call 911) it doesn't disrupt anyone else's training" - Mark Rippetoe
My NROL training log: The Eternal Beginner
SQ: 320 | DL: 435 | BP: 220 | SP: 140 | CFT: 890
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