public IHttpActionResult PutExerciseHistory(int id, ExerciseHistory exerciseHistory)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            if (id != exerciseHistory.Id)
            {
                return BadRequest();
            }

            db.Entry(exerciseHistory).State = EntityState.Modified;

            try
            {
                db.SaveChanges();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!ExerciseHistoryExists(id))
                {
                    return NotFound();
                }
                else
                {
                    throw;
                }
            }

            return StatusCode(HttpStatusCode.NoContent);
        }
        public IHttpActionResult PostExerciseHistory(ExerciseHistory exerciseHistory)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            db.ExerciseHistories.Add(exerciseHistory);
            db.SaveChanges();

            return CreatedAtRoute("DefaultApi", new { id = exerciseHistory.Id }, exerciseHistory);
        }