Shortness of breath easy after just very light activity. Little exercise last 10 y only biking slowly 30 min/day. Echo, xray, asthma ecg24hr normal...

More Workup. There are many reasons to feel short of breath and if your symptoms have continued to worsen further evaluation is warranted. Deconditioning from lack of physical exercise is a common cause, but also asthma and/or exercise induced bronchoconstriction, cardiovascular issues, etc. can contribute as well. Address concerns with primary doctor so that additional workup can be completed if concerned.