Cause Havock.

You decide to see how your possible future team mates react in chaotic situations. You disguise yourself from the minds of everyone in the room. You start off light and approach the two treadmills just as Captain America is stepping off. You plant the idea in his mind that it would be a good idea to pull down Jessica Drew's shorts while she on the treadmill. He walks up behind her and yanks down her shorts, causing her to trip and fly backwards into Cap. They now lie in a heap on the ground with her panty-clad ass firmly in his lap. "Why the hell did you do that!?" She yells. You use your mental powers to stop her from getting up just yet.
"I-I don't know, I'm sorry Jessica I-" Cap is at a loss for words, but can't help being turned on by the feeling off Spider-Woman's firm buttocks pressed against his genitals.
"Oh my god! Are you getting hard!?" Jess yells loud enough for everyone in the gym to hear. You finally allow her to get up, but you don't allow her to pull her shorts up. Instead you make her take them off completely, throw them in Caps face and shout "Keep them, you pervert!" before getting back on the treadmill.