One of my friends recently decided he wants to get in better shape so he started exercising with me. He really needs to lose weight so when he goes iwth me we just focus on cardio. We'll do stadiums, running, cycling, swimming etc. Well, a few weeks ago he started going with me, then his mom got in a bad car accident and he had to take care of her so he stopped for about two weeks. Ever since he came back he's been having trouble with the exercises we usually do. It started when he first came back. We just kind of picked up where he left off, and started with a bike ride. We rode for 14 miles, 15-16 mph pace with a sprint of about 22 mph at the finish. Afterward he started coughing really hard then ended up throwing up. I didn't think anything of it, since he hadn't been working out. Took two days off (he's somewhat flaky) and then did stadiums. Start at the bottom, sprint to about row 50, jog down, do 20 push ups, sprint, jog, 5 pull ups. We do that about 4 or 5 times and then he ended up throwing up. Next time he asked to just jog to take it easy, so we were running at an easy pace for about 5 minutes when he starts coughing and throws up. Fast forward to today, we go to the track. Run a warm up lap, stretch, then jog the curves and sprint the straightaways. We do this for two laps then stop to do some abs and push ups. He ends up throwing up. Gets some water and decides he wants to run some more. We jogged two more laps at an easy pace, and when we finished he ended up throwing up again. I told him he needs to go to the doctor to get checked out just to make sure everything is ok with his stomach. Could it be that the exercises are just too hard for him, and I need to make sure to tone it back when he's there, or could there be something wrong with him? Most of the stuff isn't hard that we're doing, but he's still throwing up. He tried eating toast about two hours before exercise, then eating nothing, eating fruit, just water, no matter what he throws up. Cliffs: Friend wants to get in shape and starts working out with me, throws up practically every time he does, not matter what we're doing or what he's eating before hand. I'm wondering if we just need to tone it down a bit or if there's something wrong with him.