Okay so I am a 21 year old male who is 5'8" and about 155lbs. I am not in bad shape but could lose a little weight around the center and really need to firm up. One of my biggest problems is I have exercised induced asthma so I can't do cardio for a really long time. It sucks cause I have bad stamina to begin with. It is kind of circular reasoning because my lack of stamina is preventing me from working on my lack of stamina. I don't have a lot of time or access to weights, machines, etc. I am trying to figure out what the best things to do would be. I am going to start this: (I can do 23 right now). I was also thinking about getting some resistance bands for isolated training like curls, etc. and getting a jump rope for cardio. I have heard a lot of good things about how effective push-ups are and I don't need to bulk up as much as get tone and work on my endurance and lose my small gut. Would it be sufficient to do the hundred push up plan 3 times a week and on each one of those days do 20 minutes of the jump rope videos? Should I add other stuff in there? Will the bands work well for me? Are there any good resistance bands and videos I should focus on? I also thought about getting one of those perfect pull up bars that grips the door frame to work on those as well. Any advice would be greatly appreciated!